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x1,y1 x2,y2
y-y1 / y2-y1 = x-x1 / x2-x1
y-6 / 4-6 = x-(-3) / 1 - (-3)
y-6 / -2 = x + 3 / 4 (lalu dikali silang)
4y - 24 = -2x - 6
2x + 4y - 24 + 6 = 0
2x + 4y - 18 = 0 (dibagi 2)
x + 2y - 9 = 0
x + 2y = 9