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Maka, m₁ = 2
m₁ . m₂ = -1
2 . m₂ = -1
m₂ = -1/2
y -y₁ = m(x -x)
y -0 = -1/2(x -(-4))
y = -1/2x -4/2 dikali 2 untuk menghilangkan penyebut, sehingga
2y = -x -4
2y +x = -4
Tidak ada jawabannya.