Real numbers x and y satisfy
x + xy = 250y
x - xy = -240y
Enter all possible values of y, separated by commas.
Add the 2 equations ==> 2x = 10y ====> x = 5y ===> substitute this into first equation
5y + 5y^2 = 250y
5y^2 = 245y
y^2 = 49y
y = 49
I think 'y' only equals 49...anyone else??
