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x1:y1 = x2:y2 4:-2 = x2:5 x2 = (4*5)/-2 x2 = -10
x = +5 or -5
Implicit: x2 + 2y = 5 Explicit : y = (5 - x2)/2
x = +5 or x = -5
x2 + 2x - 15 = (x - 3)(x + 5)