Find y if the point (-6,y) is on the line that passes through (-1,7) and (8,-2).
Slope = (-2 - 7) / ( 8 - - 1) = -9 / 9 = -1
The slope between any two points is equal....so......
( 7 - y)
_______ = -1
(-1 - - 6)
7 - y
_____ = -1
5
7 - y = 5 * -1
7 - y = - 5
7 + 5 = y = 12
