Hey SC313.

Is there any relationship between Y and X such that f(X,Y) = blah (an example Y = X + 3)? If this is the case then these will be used to setup your limits of integration.

I think the limits are implying the relationship for you since -y <= x <= y and in this case you have your answer.

As a note we usually either supply the limits, or we supply the connection between the random variables for the constraint such that f(X,Y) = c where c is a constant and f(X,Y) = a function of X and Y (like Y-X or XY).