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 Depdendent Variable

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 Dependent Variable

 Number of inequalities to solve: 23456789
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# Graphs of Straight Lines

5.2 Graphs of Straight Lines

Linear equations in two variables ( y = mx + b, Ax + By = C)

o The graph of a linear equation is a straight line

o A solution of a linear equation is an ordered pair (x, y) that makes the equation true

statement

Ex. a) Is (0, -1) a solution of y = 2x –1?

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b) Is (2, -2) a solution of y = 3x + 8?

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Ex. Find the ordered pair solution of y = -3x that corresponds to x = -1

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Ex. Find the ordered-pair solution of that corresponds to x = -4

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To graph a linear equation, find two (or more) ordered-pair solutions by choosing any value for x and finding the corresponding value of y.

x and y-intercepts ( x, 0), (0, y). To find the x-intercept you let y = 0, and to find the yintercept you let x = 0

Solve Ax + By = C for y

Graphs and equations of vertical and horizontal lines

Ex. Graph:

 a) y = x – 2 b) y = -3x + 1 d) –2x + y = 1 e) x – 4y = 8 f) y = -3 ( Horizontal line) g) x = 1 ( Vertical line) h) x + 2y = 6

Ex. Solve 2x +3y = 9 for y: ___________________________________________

HW page 270 # 3 – 23 every other odd, 29-57 every other odd, 63–113 every other odd