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- 2y = - 4x + 8
y = 2x - 4
m = 2
tegak lurus
m1 . m2 = - 1
2 . m2 = - 1
m2 = - ½
y - 4 = - ½(x - 2)
y = - ½x + 1 + 4
y = - ½x + 5
-------------------(×2)
2y = - x + 10