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2y = -3x +15
y = -3/2x +15/2
maka, m = -3/2
y -y₁ = m(x -x₁)
y -8 = -3/2(x -3)
y -8 = -3/2x +6/2
y -8 = -3/2x +3 dikali 2 untuk menghilangkan penyebut, sehingga
2y -16 = -3x +6
2y = -3x +6 +16
2y = -3x +22
3x +2y -22 = 0
2y = -3+6+16
2y = -3+22
3×+2y-22 = 0