$$f(x,y) = \begin{cases} \dfrac{x^2+y}{4} & 0<x<y<2 \\[8pt] 0 & \text{otherwise} \end{cases} $$
Find Marginal PDF for $x$ and $y$.
I know the formula is $\int^\infty_{-\infty} f(x,y)\,dy = $ Marginal PDF for $x$ and the same for $y$ just the integral with respect to $x$. However I don't understand what limits for integration I should use or how to go about finding them.