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5y = -3x +15
y = -3/5x +15/5
y = -3/5x +3
maka, m = -3/5
y -y₁ = m(x -x₁)
y -(-3) = -3/5(x -2)
y +3 = -3/5x +6/5 dikali 5 untuk menghilangkan penyebut, sehingga
5y +15 = -3x +6
5y = -3x +6 -15
5y = -3x -9