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Write an equation for the line that goes through the points (8, -4) and (0, 12)

 Apr 1, 2020
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Equation of line    y = mx + b    m = slope   b = y-axis intercept (value of y when x = 0)

 

find slope      (y1-y2)/(x1-x2)         it does not matter which point you assign as '1' or '2'

                        (-4-12)/(8-0) = - 2    = m = slope

 

y = -2x + b     now put in either one of the given points to calulate 'b'

12 = -2(0) + b     b = 12

 

y = -2x+12

 Apr 1, 2020

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