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Lesson 10 Equation of a line y = m x + b

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(-3,2) (4,-3) Graph point (-3,2) Graph point 4,-3) Draw line Draw vertical side of triangle Draw horizontal side of triangle

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(-3,2) (4,-3) y is changing from 2 to -3 Change in y = (-3) – (2) Change in y = -5 Y = 2 Y = 1 Y = 0 Y = -1 Y = -2 Y = -3

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(-3,2) (4,-3) x is changing from -3 to 4 Change in x = (4) – (-3) Change in x = 7 x = -3x = -2x = -1x = 0x = 1x = 2x = 3x = 4

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(-3,2) (4,-3) Change in y = -5 Change in x = 7

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(-3,2) (4,-3) Change in y = -5 Change in x = 7 Slope-intercept form of a line.

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(-3,2) (4,-3) Change in y = -5 Change in x = 7 Slope-intercept form of a line. b is the y-intercept It appears to be 0. Is it?

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