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- 3y = - 4x + 12
y = 4/3 x - 4
m1 = 4/3
syarat tegak lurus
m1 . m2 = - 1
4/3 . m2 = - 1
m2 = - 1 ÷ 4/3
= - 1 × ¾
= - ¾