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y = -3/4x + 5/4
y = mx + c
m1 = -3/4
m2 = 4/3
y - y1 = m(x - x1)
y - 2 = 4/3(x + 1)
y - 2 = 4/3x + 4/3
kalikan 3 untuk semuanya
3y - 6 = 4x + 4
3y = 4x + 10
-4x + 3y = 10
4x - 3y = -10