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y-y1 per y2-y1 = x-x1 per x2-x1
y-3 per 0-3 = x+4 per 2+4
y-3 per -3 = x+4 per 6
6(y-3) = -3(x+4)
6y-18 = -3x-12
6y = -3x-12+18
6y = -3x+6
y = -1/2 x +1