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(-1,4) ⇒x2, y2
y-y1 per y2-y1 = x-x1 per x2-x1
y-3 per 4-3 = x-2 per -1-2
y-3 per 1 = x-2 per -3
-3y + 9 = x-2
-x - 3y + 9 + 2 = 0
-x - 3y + 11 = 0
x + 3y -11 = 0