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-4y = -2x + 6
y = -2/-4x + 6/4
y = 2/4x + 6/4
2(y = 1/2x + 3/2)
2y = x + 3
2y - x - 3 = 0
pers. garis = y - y1 = m (x - x1)
y - 2 = 1/2 (x - 3)
2(y - 2 = 1/2x - 3/2)
2y - 4 = x - 3
2y = x - 3 + 4
2y = x - 1
2y - x + 1 = 0
2x -6 = 4y
4y = 2x -6
y = 2/4 x -6/4
maka, m = 2/4
y -y₁ = m(x -x₁)
y -2 = 2/4(x -3)
y -2 = 2/4x -6/4 dikali 4 untuk menghilangkan penyebut, sehingga
4y -8 = 2x -6
4y = 2x -6 +8
4y = 2x +2
atau
-2x +4y -2 = 0