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y-y1/y2-y1 = x-x1/x2-x1
y-0/3-0 = x-(-2)/0-(-2)
y/3 = x+2/2
-------------------x6
2y = 3x+6
2y-3x-6=0
x2 = 0
y1 = 0
y2 = 3
(x - x1) / ( x2 - x1 ) = ( y - y1) / ( y2-y1 )
( x-(-2)) / ( 0-(-2))= ( y - 0 ) /( 3-0 )
( x + 2 )/ 2 = y / 3
3 ( x + 2 ) = 2y
3x + 6 = 2y
3x - 2y + 6 = 0