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Y - y1 / y2 - y1 =x - x1 / x2 - x1
y - 1 / -1 - 1 = x - 2 / -3 - 2
y - 1 / -2 = x - 2 / -5
-5(y - 1) = -2(x - 2)
-5y + 5 = -2x + 4
-5y = -2x + 4 - 5
-5y = -2x - 5 { dikalikan-1}
5y = 2x + 5
y = 2x + 5 / 5
m = 2/5 dan c = 5/5 = 1