$\displaystyle x^2+y^2+r^2-2s+13=0$

$\displaystyle x^3-y^3-r^3+3s+59=0$

How do I find the partial derivatives of x(r,s) or y(r,s) implicitly? I tried implicit differentiation and I got 2 different answers for either. Can someone show me any of the 4 derivatives step-by-step?