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y = 8x +16
maka, m₁ = 8
m₁ . m₂ = -1
8 . m₂ = -1
m₂ = -1/8
y -y₁ = m(x -x₁)
y -5 = -1/8(x -3)
y -5 = -1/8 x +3/8 dikali 8 untuk menghilangkan penyebut, sehingga
8y -40 = -x +3
8y = -x +3 +40
8y = -x +43
atau
x +8y -43