Suppose that the joint distribution of X and Y is uniform over the region in the xy-plane

Question:

Suppose that the joint of X and Y is uniform over the region in the xy-plane bounded by the four lines x =−1, x = 1, y = x + 1, and y = x − 1.
Determine
(a) Pr(XY > 0)
(b) The conditional p.d.f. of Y given that X = x.
Distribution
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