sir i am stuck for this question

4. (40 points) Let the joint pdf of X and Y be: f(x,y) =k, OSxs1,0sysixsy. Equivalently, f(x. y) = klon(x)/[x.(y). Hint: Start by drawing the area where f (x, y) 2 0. a) (3 points) Find k to make this a PDF. b) (3 points) Find fx(x) (the marginal probability density function of X). c) (4 points) Find fy(y) (the marginal probability density function of Y). d) (5 points) Find fxjymy(x) (the conditional probability density function of X given Y = y)