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y-2=-5/3(x+1)
3y-6=-5x-5
5x+3y-1=0
3y = -5x -17
y = -5/3x -17/3
maka, m(gradien) = -5/3
y -y₁ = m(x -x₁)
y -2 = -5/3(x -(-1))
y -2 = -5/3x -5/3 dikali 3 untuk menghilangkan penyebut, sehingga
3y -6 = -5x -5
3y = -5x -5 +6
3y = -5x +1
5x +3y -1 = 0