What Values of (x, y) Make f(x, y) = 1/(x - y^2) Undefined?

[M.Qayyum]

Here is my question, that what is the domain of f, while
f(x,y)=1/(x-y²)

 

[MechanicalMan]

Ask yourself this question, and you'll have answered your own question:

For what values of (x,y) is f(x,y) undefined?