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Karena tegak lurus maka m1.m2 = -1
Jadi m = -3/2
PG melalui (-2, 4) gradien m = -3/2::
y - 4 = -3/2 (x+2)
2 (y-4) = -3 (x+2)
2y - 8 = -3x - 6
3x + 2y - 2 = 0