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-2y = -x-6
y = 1/2 x
m = 1/2
⇒ tegak lurus ⇒ m1.m2 = -1
m2 = -1/1/2
m2 = -2
⇒ y - y1 = m (x - x1)
y + 4 = -2(x - 2 )
y + 4 = -2x + 4
y = -2x