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y - y1 = x - x1
y2 - y1 x2-x1
y - (-2) = x - 2
1 - (-2) -4 - 2
y + 2 = x - 2
3 -6
-6y -12 = 3x - 6
-6y = 3x - 6 + 12
6y = -3x + 6 - 12
6y = -3x - 6
y = -1/2x - 1
karena tegak lurus, maka m2.m1 = -1
m1 = -1/2
m2 = 2
y = 2x - 1