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y - y1 = m (x - x1)
a. (1,3) m= 2
y - 3 = 2( x - 1)
y-3=2x - 2
y= 2x + 1
b.
y (- 4) = 1/4 ( x -(-3)
y + 4 = 1/4 ( x+ 4)
y + 4 = 1/4 x + 1
y = 1/4 x - 3 ----> kalikan dgn 4
4y = x - 12
4y - x = -12