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x = 1 --> m = -3/2
(x,y) = (1,3)
y - y1 = m (x-x1)
y - 3 = -3/2 ( x - 1)
2(y-3) = -3(x-1)
2y - 6 = - 3x + 3
3x+ 2y - 9 = 0