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y-y1 = m(x-x1)
y-7 = -1(x-5)
y-7 = -x+5
x+y-7-5 = 0
x+y-12 = 0
atau
x+y = 12
y-7=-1(x-5)
y-7=-x+5
y=-x+12
kalau gk salah seperti itu...