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= (-7)/(14)
= -(1/2)
tegak lurus
m1 x m2 = -1
-(1/2) x m2 = -1
m2 = 2
y - 4 = 2(x - (-2))
y = 2x + 2 + 4
y = 2x + 6 atau 2x - y + 6 = 0