X is a continuous rv with the pdf: $$ f_{X}(x)= \begin{cases}2 x & 1 \geq x \geq 0 \\ 0 & \text { elsewhere }\end{cases} $$
We know that given X = x , the random variable Y is uniformly distributed on [−x, x].
I need to find the joint PDF and marginal Fy(y).