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x2, y2 = 5,1
(y - y1) ÷ (y2 - y1) = (x - x1) ÷ (x2 - x1)
(y - 4) ÷ (1 - 4) = (x - 3) ÷ (5 -3)
(y - 4) ÷ (-3) = (x - 3) ÷ (2) -> kali silang
2(y - 4) = -3(x - 3)
2y - 8 = -3x + 9
2y = -3x + 17
y = -3/2 x + 17/2 -> bentuk y = mx + c, m -> gradien
gradien garis = -3/2
gradien garis sejajar -> tetap
persamaan garis yang melalui titik (4,6)
y - y1 = m(x - x1)
y - 6 = -3/2 (x - 4) ||x 2 semua
2y - 12 = -3 (x - 4)
2y - 12 = -3x + 12
2y = -3x + 24