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y = -2x +4
maka, m₁ = -2
m₁ . m₂ = -1
-2 . m₂ = -1
m₂ = 1/2
y -y₁ = m(x -x₁)
y -0 = 1/2(x -0)
y = 1/2x
atau
2y = x