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y - y1 = m(x - x1)
y - 1 = 2 (x - 0)
y - 1 = 2x
y - 2x - 1 = 0
2.
y-y1 / y2-y1 = x-x1 / x2-x1
y-3 / 5-3 = x-4 / 0-4
y-3 / 2 = x-4 / -4
-4y + 12 = 2x - 8
-4y - 2x = -8 - 12
-4y - 2x = -20
__________ : -2
2y + x = 10