chapter 4
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Chapter 4. Algebra I and Concepts. Day 1, Section 4-1: Graphing in Slope-Intercept Form. Slope-Intercept Form: Any equation written in the form y = mx + b m: b: Which of the following are in slope intercept form? Are any in standard form? - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 4
Algebra I and Concepts
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Day 1, Section 4-1: Graphing in Slope-Intercept Form
Slope-Intercept Form: Any equation written in the form y = mx + bm: b:
Which of the following are in slope intercept form? Are any in standard form?a) 4y = 2x + 6 b) y = 3x – 5c) 2x – 5y = 12
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Day 1, Section 4-1: Graphing in Slope-Intercept Form
Ex) Identify the slope and the y-intercept of the following equationsa) y = ½x – 5 b) y = x + 7 c) 2x – 3y = 12
Ex) Write an equation of a line in slope-intercept form, given the slope and the y-intercepta) Slope: 4, y-intercept: -2 a) m = 6, b = 12
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Day 1: Section 4-1
Write an equation in slope-intercept form for the graph pictured1) 2)
3)
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Day 2, Section 4-1: Graphing in Slope-Intercept Form
Steps to Graphing an equation in slope-intercept form. Ex) 1) Plot the ________________2) Count the slope________ over _________, And plot a second point3) Draw a line connecting The 2 points
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Day 2, Section 4-1: Graphing in Slope-Intercept Form
Slope MovementPositive Numbers: UP/RIGHT
Negative Number: DOWN/LEFTEx) Graph the following equations using slope-intercept form methoda) b) y = 5x + 8
c) 5x – 3y = 15
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Day 3: Section 4-1, Horizontal and Vertical Lines
Graphing Horizontal LinesEquations look like this: y = a number (there is NO x variable!)To Graph:1) Draw a horizontal line through that numberGraph y = -2
Graphing Vertical LinesEquations look like this:
x = a number(there is NO y variable)To Graph:1) Draw a vertical line through that numberGraph x = 6
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Day 3: Section 4-1, Horizontal and Vertical Lines
Graph the following lines. First determine if the line is horizontal, vertical, or oblique.1) y = 4 2) y = -2x + 4
3) x = -1
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Day 1: Section 4-4, Parallel Lines
Parallel Lines – lines that do not intersect and have the SAME SLOPE!Ex) Use the 3 graphs to determine by looking if the lines are parallel
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Day 1: Section 4-4, Parallel Lines
Which of the following lines are parallel? Note: you must be able to identify the slope in each equation!a)b)c)d)e)
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Day 2: Section 4-4 Perpendicular Lines
Opposite Reciprocals – 2 numbers whose product is -1. Flip and switch the sign!Perpendicular Lines - Lines that intersect to form a right angle. Perpendicular lines have slopes that are opposite reciprocals.Ex) Find the opposite reciprocals of the following numbersa) 3 b) -5 c) ½
d) -¾
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Day 2: Section 4-4, Comparing Lines Determine if the lines are parallel, perpendicular, or neither.1)
2)
3)4)
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Section 4-5, Scatterplots
Scatterplot – a graph showing the relationship between a set of data with 2 variables
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Section 4-5, Scatterplots
Ex) What kind of correlation does the graph have? Describe its meaning.
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Section 4-5, Scatterplots
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Section 4-5: Scatterplots
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Section 4-5: Scatterplots