Question 608098
2x - x^2 / 100 = y


200x - x^2 = 100y ___ x^2 - 200x = -100y


completing the square ___ x^2 - 200x + 10000 = 10000 - 100y


(x - 100)^2 = 100(100-y)


taking square root ___ x - 100 = ± 10 √(100-y) ___ x = 100 ± 10 √(100-y)