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y-y1 = m (x-x1)
y-2 = 1/2 (x-1)
2(y-2) =1(x-1)
2y-4 = x-1
2y-x = 3
m1 x m2 = -1
-2 x m2 = -1
m2 = -1/-2 = 1/2
y-y1 = m (x-x1)
y - 2= 1/2 (x - 1) x2
2y - 4 = 1 (x - 1)
2y - 4 = x - 1
2y - x = 3
maaf kalau salah ya