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x1:y1 = x2:y2 4:-2 = x2:5 x2 = (4*5)/-2 x2 = -10
x2 + 2y = 52 + 2*2 = 25 + 4 = 29
If x = 8 then x2 = 82 = 8 x 8 = 64
x2 + x - 30 = (x + 6)(x - 5)
x = +5 or x = -5