If there are x men and y women in a choir, and there are z more men than there are women in that choir, what is z?
(1) x^2 2xy + y^2 9 = 0
(2) x^2 + 2xy + y^2 225 = 0![]()
(1) x^2 2xy + y^2 9 = 0
(2) x^2 + 2xy + y^2 225 = 0