(16 pts) Let X1 and X2 are joint continuous R. V.s with joint pdf uniformly distributed in 0

(16 pts) Let Xl and X2 are joint continuous R.V.s with joint pdfunifonnly distributed in 1, 0Sx2S 1, that is OSXIS1,OSx S 1 otherese a. b. Let Yl = Xl + Xl and Y2 = Xl. Find the joint pdf fy (yl,y'2) of Yl and Y2. Graph the region (shadow the region) in which (y ,y2) 0. Indicate the coordinates of the comer points.