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8x +16 = 2y
2y = 8x +16
y = 8/2x +16/2
y = 4x +8
maka, m₁ = 4
m₁ . m₂ = -1
4 . m₂ = -1
m₂ = -1/4
y -y₁ = m(x -x₁)
y -6 = -1/4(x -8)
y -6 = -1/4x +8/4
y -6 = -1/4x +2 dikali 4 untuk menghilangkan penyebut, sehingga
4y -24 = -x +8
4y = -x +8 +24
4y = -x +32
x +4y -32 = 0