Read and understand the situation.

Joan helps feed the chickens in her father’s farm. Each day, a chicken eats 70 g of growing mass. Joan

must prepare a food budget for the chickens.

DAILY FOOD BUDGET

Number of Chickens Amount of Food

70 g

140 g

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No. Of Chickens 1 2 3 4 5 6 7 8

Amount of food 70 140

a. Complete this table.

b. In your own words, describe how to find the amount of food needed for a day if you know the number of chickens.

c. Write the relationship between the amount of food needed and the number of chickens in symbols.

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a. Is it possible to substitute a negative number for r? Why or why not?

b. Can r have a fraction like ½ or ¾ as its value? Why or why not?

c. Can 70 be replaced by another number? Why or why not?

Answer the following questions on your paper.

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Since r can take on many different values, we say that r is a variable.

Its value varies.

On the other hand, 70 is a constant since the amount of food for each chicken each day is a fixed value.

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