How to graph $x-y \leq z$ where the function is only defined in a triangle.

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I'm really bad at graphing more "difficult" equations. I get lost in the constraints. Could anyone give me tips and show me what the graph of the following equation should look like?

We have two random variables $X$ and $Y \in [0,1]$. $X$ and $Y$ only take on values within a triangle with vertices $(0,1), (0,-1), (1,0)$. What would the graph of $x-y \leq z$ with $x \geq y$ look like within this triangle?

Thanks a lot.