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cari gradien dulu..
4y=-3x+5
y=-3/4x + 5/4
m1=-3/4
m2=4/3
y-y1 = m(x-x1)
y-2 = 4/3(x+1)
y-2=4/3x + 4/3
y=4/3x + 4/3 + 6/3
y=4/3x + 10/3
____________ x3
3y=4x + 10
atau -4x+3y-10=0
ax - by = a(x1) - b(y1)
4x-3y = 4(-1) - 3(2)
4x-3y=-4-6
4x-3y=-10
4x-3y+10 = 0