Equation of a line y = m x + b

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Presentation transcript:

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

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

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

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

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

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

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