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P(x1,y1) Q(x2,y2)
y - y1 / x - x1 = y2 - y1 / x2 - x1
y - -5 / x - 2 = -1 - -5 / -3 - 2
y + 5 / x - 2 = 4 / -5
-5(y + 5) = 4(x - 2)
-5y -25 = 4x - 8
-5y = 4x + 17