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m = -a/b
garis P x + 2y-5 =0
mP = -1/2
tegak lurus garis Q
mP .mQ = -1
-1/2 .mQ= -1
mQ = 2
A) gradien garis Q = 2
B) y - y1 = mQ (x-x1)
y - 5 = 2 (x -(-3))
y -5 = 2x + 6
y = 2x +11
semoga membantu