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y - y1 = x - x1
y2-y1 x2-x1
y - 2 = x - 3
4 -2 -1-3
y - 2 = x - 3
2 -4
-4y + 8 = 2x - 6
-4y = 2x - 6 - 8
-4y = 2x - 14
4y = -2x - 14
y = -1/2x - 14/4
y = mx + c
m = -1//2
karena tegak lurus :
m1 . m2 = -1
-1/2 . m2 = -1
m2 = -1 * -2
m2 = 2
jadi, cari pertamaan yang gradiennya = 2