Unit 2 Homework Assignments : Introducing Proportional Relationships Lesson 1: One of These Things Is 1 Not Like the Others 

1. Which one of these shapes is not like the others? Explain what makes it different by representing each width and height pair with a ratio. 

 2. In one version of a trail mix, there are 3 cups of peanuts mixed with 2 cups of raisins. In another 

version of trail mix, there are 4.5 cups of peanuts mixed with 3 cups of raisins. Are the ratios equivalent for the two mixes? Explain your reasoning. 

   

3. For each object, choose an appropriate scale for a drawing that fits on a regular sheet of paper. Not all of the scales on the list will be used. (from Unit 1, Lesson 12) 

Objects  

A. A person 

B. A football field (120 yards by 53 yards)31  

C. The state of Washington (about 240 miles by 

360 miles) 

D. The floor plan of a house 

E. A rectangular farm (6 miles by 2 mile) 

Scales  

1. 1 in : 1 ft 2. 1 cm : 1 m 3. 1 : 1,000 4. 1 ft : 1 mile 5. 1 : 100,000 6. 1 mm : 1 km 7. 1 : 10,000,000 

 4. Which scale is equivalent to 1 cm to 1 km? (from Unit 1, Lesson 11) 

 1 to 1000 10,000 to 1 1 to 100,000 100,000 to 1 1 to 1,000,000 

  

5. a. Find 3 different ratios that are equivalent to . (from Grade 7, Unit 2, Lesson 5) 37 :    

b. Explain why these ratios are equivalent. 

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Lesson 2: Introducing Proportional Relationships with Tables 

1. When Han makes chocolate milk, he mixes 2 cups of milk with 3 tablespoons of chocolate syrup. Here is a table that shows how to make batches of different sizes. 

Use the information in the table (and bank) to complete the statements. Some terms are used more than once.  

a. The table shows a proportional relationship between _________ and _________ . 

 

b. The scale factor shown is _________ .  c. The constant of proportionality for this relationship is _________ .  d. The units for the constant of proportionality are _________ per _________ .  

 Bank of Terms: tablespoons of chocolate syrup, , cups of milk, cup of milk, 4 2

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2. A certain shade of pink is created by adding 3 cups of red paint to 7 cups of white paint. 

a. How many cups of red paint should be added to 1 cup of white paint? 

 b. What is the constant of proportionality? 

 

 3. A map of a rectangular park has a length of 4 inches and a width of 6 inches. It uses a scale of 1 inch 

for every 30 miles. (from Unit 1, Lesson 12)  

a. What is the actual area of the park? Show how you know.   

b. The map needs to be reproduced at a different scale so that it has an area of 6 square inches and can fit in a brochure. At what scale should the map be reproduced so that it fits on the brochure? Show your reasoning. 

 

4. Noah drew a scaled copy of Polygon P and labeled it Polygon Q. (from Unit 1, Lesson 6) 

 If the area of Polygon P is 5 square units, what scale factor did Noah apply to Polygon P to create Polygon Q? Explain or show how you know. 

 

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5. Select all the ratios that are equivalent to each other.  74 : 158 : 6 281 : 32 : 0 352 :  

         

 Lesson 3: More about Constant of Proportionality 

1. Noah is running a portion of a marathon at a constant speed of 6 miles per hour. 

 Complete the table to predict how long it would take him to run different distances at that speed, and how far he would run in different time intervals. 

 2. One kilometer is 1000 meters. 

a. Complete the tables. What is the interpretation of the constant of proportionality in each case? 

  

The constant of proportionality tells us that:  

 

The constant of proportionality tells us that:   

b. What is the relationship between the two constants of proportionality?  

 3. Jada and Lin are comparing inches and feet. Jada says that the constant of proportionality is 12, Lin 

says it is . Do you agree with either one of them? Why or why not?112  

   

4. The area of the Mojave desert is 25,000 square miles. A scale drawing of the Mojave desert has an area of 10 square inches. What is the scale of the map? (from Unit 1, Lesson 12) 

  

 5. Which of these scales is equivalent to the scale 1 cm to 5 km? Select all that apply. (from Unit 1, Lesson 

11)  

3 cm to 15 km 1 mm to 150 km 5 cm to 1 km 5 mm to 2.5 km 1 mm to 500 m 

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6. Which one of these pictures is not like the others? Explain what makes it different using ratios. (from Unit 2, Lesson 1) 

 

 Lesson 4: Proportional Relationships and Equations 

1. A certain ceiling is made up of tiles. Every square meter of ceiling requires 10.75 tiles. Fill in the table with the missing values. 

 2. On a flight from New York to London, an airplane travels at a constant speed. An equation relating the 

distance traveled in miles, , to the number of hours flying, , is . How long will it take thed t dt = 1500  

airplane to travel 800 miles?   

3. Each table represents a proportional relationship. For each, find the constant of proportionality, and write an equation that represents the relationship. 

 

Constant of proportionality:  Equation:  P =  

 

Constant of proportionality:   Equation:  C =  

4. A map of Colorado says that the scale is 1 inch to 20 miles or 1 to 1,267,200. Are these two ways of reporting the scale the same? Explain your reasoning. (from Unit 1, Lesson 11)    

5. Here is a polygon on a grid. (from Unit 1, Lesson 3) 

 

a. Draw a scaled copy of the polygon using a scale factor 3. Label the copy A. 

b. Draw a scaled copy of the polygon with a scale factor .21  

Label it B. 

c. Is Polygon A a scaled copy of Polygon B? If so, what is the scale factor that takes B to A?  

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Lesson 5: Two Equations for Each Relationship 

1. The table represents the relationship between a length measured in meters and the same length measured in kilometers. 

a. Complete the table.  

b. Write an equation for converting the number of meters to kilometers. Use for number of meters and for number ofx y  kilometers. 

 

2. Concrete building blocks weigh 28 pounds each. Using for the number of concrete blocks and forb w  the weight, write two equations that relate the two variables. One equation should begin with andw =  the other should begin with .b =  

 w = b =  

 3. A store sells rope by the meter. The equation represents the price (in dollars) of a piece.8Lp = 0 p  

of nylon rope that is meters long.L   

a. How much does the nylon rope cost per meter?  

b. How long is a piece of nylon rope that costs $1.00?   

4. The table represents a proportional relationship. Find the constant of proportionality and write an equation to represent the relationship. (from Unit 2, Lesson 4) 

 Constant of proportionality: __________  Equation: y =  

  

5. On a map of Chicago, 1 cm represents 100 m. Select all statements that express the same scale. (from Unit 1, Lesson 8) 

 a. 5 cm on the map represents 50 m in Chicago. 

b. 1 mm on the map represents 10 m in Chicago. 

c. 1 km in Chicago is represented by 10 cm the map. 

d. 100 cm in Chicago is represented by 1 m on the map.  

 

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Lesson 6: Using Equations to Solve Problems 

1. A car is traveling down a highway at a constant speed, described by the equation , where 5td = 6 d  represents the distance, in miles, that the car travels at this speed in hours.t  

a. What does the 65 tell us in this situation?  

b. How many miles does the car travel in 1.5 hours?  

c. How long does it take the car to travel 26 miles at this speed?   

2. Elena has some bottles of water that each holds 17 fluid ounces. 

a. Write an equation that relates the number of bottles of water ( ) to the total volume ofb  water ( ) in fluid ounces.w  

 b. How much water is in 51 bottles? 

  

c. How many bottles does it take to hold 51 fluid ounces of water?   

3. There are about 1.61 kilometers in 1 mile. Let represent a distance measured in kilometers and x y  represent the same distance measured in miles. Write two equations that relate a distance measured in kilometers and the same distance measured in miles. (from Unit 2, Lesson 5) 

   

4. In Canadian coins, 16 quarters is equal in value to 2 toonies. (from Unit 2, Lesson 2) 

a. Fill in the table.  

b. What does the value next to 1 mean in this situation?    

 

5. Each table represents a proportional relationship. For each table: (from Unit 2, Lesson 2) 

a. Fill in the missing parts of the table. 

b. Draw a circle around the constant of proportionality. 

 

 

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6. Describe some things you could notice in two polygons that would help you decide that they were not scaled copies. (from Unit 1, Lesson 4) 

   

 Lesson 7: Comparing Relationships with Tables 

1. Decide whether each table could represent a proportional relationship. If the relationship could be proportional, what would the constant of proportionality be? 

a. How loud a sound is depending on how far away you are 

 

b. The cost of fountain drinks at Hot Dog Hut. 

 

 

 

2. A taxi service charges $1.00 for the first mile then $0.10 for 110  

each additional mile after that.110  

 Fill in the table with the missing information then determine if this relationship between distance traveled and price of the trip is a proportional relationship. 

  

3. A rabbit and turtle are in a race. Is the relationship between distance traveled and time proportional for either one? If so, write an equation that represents the relationship. 

Turtle’s Run: 

 

Rabbit’s Run: 

 4. For each table, answer: What is the constant of proportionality? (from Unit 2, Lesson 2) 

 

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5. Kiran and Mai are standing at one corner of a rectangular field of grass looking at the diagonally opposite corner. Kiran says that if the the field were twice as long and twice as wide, then it would be twice the distance to the far corner. Mai says that it would be more than twice as far, since the diagonal is even longer than the side lengths. Do you agree with either of them? (from Unit 1, Lesson 4) 

  

 Lesson 8: Comparing Relationships with Equations 

 

1. The relationship between a distance in yards ( ) and they  same distance in miles ( ) is described by the equationm  

.760my = 1  a. Find measurements in yards and miles for distances 

by filling in the table.   

b. Is there a proportional relationship between a measurement in yards and a measurement in miles for the same distance? Explain why or why not. 

  

2. Decide whether or not each equation represents a proportional relationship. 

a. The remaining length ( ) of 120-inch rope after inches have been cut off: L x 201 − x = L  b. The total cost ( ) after 8% sales tax is added to an item's price ( ): t p .08p1 = t  c. The number of marbles each sister gets ( ) when marbles are shared equally among fourx m  

sisters: x = 4m  

d. The volume ( ) of a rectangular prism whose height is 12 cm and base is a square with sideV  lengths cm: s 2sV = 1 2  

 

3. a. Use the equation to fill inxy = 25  

the table. ->  

Is proportional to and ?y x y  Explain why or why not. 

 

b. Use the equation to fill.2xy = 3 + 5  in the table. ->  

Is proportional to and ?y x y  Explain why or why not. 

 

      

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4. To transmit information on the internet, large piles are broken into packets of smaller sizes. Each packet has 1,500 bytes of information. An equation relating packets to bytes of information is given by 

where represents the number of packets and represents the number of bytes of, 00pb = 1 5 p b  information. (from Unit 2, Lesson 6) 

 a. How many packets would be needed to transmit 30,000 bytes of information? 

 b. How much information could be transmitted in 30,000 packets? 

 c. Each byte contains 8 bits of information. Write an equation to represent the relationship 

between the number of packets and the number of bits.  

 Lesson 9: Solving Problems about Proportional Relationships 

1. For each situation, explain whether you think the relationship is proportional or not. Explain your reasoning. 

a. The weight of a stack of standard 8.5 x 11 copier paper vs. number of sheets of paper.   

b. The weight of a stack of different-sized books vs. the number of books in the stack. 

 2. Every package of a certain toy also includes 2 batteries. 

a. Are the number of toys and number of batteries in a proportional relationship? If so, what are the two constants of proportionality? If not, explain your reasoning. 

 b. Use for the number of toys and for the number of batteries to write two equationst b  

relating the two variables. b = t =  

 

3. Lin and her brother were born on the same date in different years. Lin was 5 years old when her brother was 2. 

a. Find their ages in different years by filling in the table. 

b. Is there a proportional relationship between Lin’s age and her brother’s age? Explain your reasoning. 

 

4. A student argues that does not represent a proportional relationship between and y = x9 x y  

because we need to multiply one variable by the same constant to get the other one and not divide it by a constant. Do you agree or disagree with this student? (from Unit 2, Lesson 8) 

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4. Quadrilateral A has side lengths 3, 4, 5, and 6. Quadrilateral B is a scaled copy of Quadrilateral A with a scale factor of 2. Select all of the following that are side lengths of Quadrilateral B. (from Unit 1, Lesson 3) 

5  6  7  8  9  

Lesson 10: Introducing Graphs of Proportional Relationships 

1. Which graphs could represent a proportional relationship? Explain how you decided. 

 

2. A lemonade recipe calls for cup of lemon juice for every cup of water.41  

a. Use the table to answer these questions. i. What does represent?x  ii. What does represent?y  iii. Is there a proportional relationship between and ?x y  

 b. Plot the pairs in the table in a coordinate plane. 

  

3. Decide whether each table could represent a proportional relationship. If the relationship could be proportional, what would be the constant of proportionality? (from Unit 2, Lesson 7) 

a. The sizes you can print a photo  

 

b. The distance from which a lighthouse is visible. 

 

  

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4. Select all of the pieces of information that would tell you and have a proportional relationship.x y  Let represent the distance between a rock and a turtle's current position in meters and representy x  the number of minutes the turtle has been moving. (from Unit 2, Lesson 9) 

a. xy = 3  

b. After 4 minutes, the turtle has walked 12 feet away from the rock. 

c. The turtle walks for a bit, then stops for a minute before walking again. 

d. The turtle walks away from the rock at a constant rate.  

Lesson 11: Interpreting Graphs of Proportional Relationships 

1. There is a proportional relationship between the number of months a person has had a streaming movie subscription and the total amount of money they have paid for the subscription. The cost for 6 months is $47.94. The point  is shown on the graph below.6, 47.94)(  

a. What is the constant of proportionality in this relationship? 

 b. What does the constant of proportionality 

tell us about the situation?  c. Add at least three more points to the 

graph and label them with their coordinates. 

 d. Write an equation that represents the 

relationship between , the total cost ofC  the subscription, and , the number ofm  months. 

 

 

2. The graph shows the amounts of almonds, in grams, for different amounts of oats, in cups, in a granola mix. Label the point on the graph, find the value of , and explain its1, k)( k  meaning. 

 

 

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3. To make a friendship bracelet, some long strings are lined up then taking one string and tying it in a knot with each of the other strings to create a row of knots. A new string is chosen and knotted with the all the other strings to create a second row. This process is repeated until there are enough rows to make a bracelet to fit around your friend's wrist. 

 Are the number of knots proportional to the number of rows? Explain your reasoning. (from Unit 2, Lesson 9) 

  

4. What information do you need to know to write an equation relating two quantities that have a proportional relationship? (from Unit 2, Lesson 9) 

  

 Lesson 12: Using Graphs to Compare Relationships 

1. Match each equation to its graph. 

A. xy = 2   B. xy = 5

4   C. xy = 4

1   D. xy = 3

2   E. xy = 3

4   F. xy = 2

3  

1 2 3 

 4 5 6 

         

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2. The graphs below show some data from a coffee shop menu. One of the graphs shows cost (in dollars) vs. drink volume (in ounces), and one of the graphs shows calories vs. drink volume (in ounces). 

_________________ vs volume 

 

_________________ vs volume 

 

a. Which graph is which? Give them the correct titles.  

b. Which quantities appear to be in a proportional relationship? Explain how you know.  

c. For the proportional relationship, find the constant of proportionality. What does that number mean? 

 3. Lin and Andre biked home from school at a steady pace. Lin biked 1.5 km and it took her 5 minutes. 

Andre biked 2 km and it took him 8 minutes.  

a. Draw a graph with two lines that represent the bike rides of Lin and Andre.  

b. For each line, highlight the point with coordinates and find .1, k)( k   

c. Who was biking faster?  

Lesson 13: Two Graphs for Each Relationship  

1. At the supermarket you can fill your own honey bear container. A customer buys 12 oz of honey for $5.40. 

a. How much does honey cost per ounce?  

b. How much honey can you buy per dollar? 

c. Write two different equations that represent this situation. Use for ounces of honey and for cost in dollars.h c  

d. Choose one of your equations, and sketch its graph. Be sure to label the axes. 

 

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2. The point lies on the graph representing a proportional relationship. Which of the following3, )( 56  

points also lie on the same graph?  

1, 0.4)( 1.5, )( 610 , 3)( 5

6 4, )( 511 15, 6)(  

3. A trail mix recipe asks for 4 cups of raisins for every 6 cups of peanuts. There is proportional relationship between the amount of raisins, (cups), and the amount of peanuts, (cups), in thisr p  recipe. 

a. Write the equation for the relationship that has constant of proportionality greater than 1. Graph the relationship. 

 b. Write the equation for the relationship that has constant of proportionality less than 1. Graph 

the relationship.   

4. Here is a graph that represents a proportional relationship. (from Unit 2, Lesson 11) 

a. Come up with a situation that could be represented by this graph. 

b. Label the axes with the quantities in your situation. 

c. Give the graph a title. 

d. Choose a point on the graph. What do the coordinates represent in your situation? 

 

Lesson 14: Four Representations 

1. The equation shows how much it costs to buy gas at a gas station on a certain day. In the.95gc = 2  equation, represents the cost in dollars, and represents how many gallons of gas were purchased.c g  

 a. Write down at least four (gallons of gas, cost) pairs that fit this relationship. 

 b. Create a graph of the relationship. 

 c. What does 2.95 represent in this situation? 

 d. Jada’s mom remarks, “You can get about a third of a gallon of gas for a dollar.” Is she 

correct? How did she come up with that? 

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2. There is a proportional relationship between a volume measured in cups and the same volume measured in tablespoons. 3 cups is equivalent to 48 tablespoons, as shown in the graph. 

 a. Plot and label at least two more points that represent the relationship. 

 b. Use a straightedge to draw a line that represents this proportional relationship. 

 c. For which value y is on the line you just drew?1, y)(  

 d. What is the constant of proportionality for this relationship? 

 e. Write an equation representing this relationship. Use for cups and for tablespoons.c t  

 

 

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