If the joint probability density function of X and Y is,

f(x,y)=1/8(6-x-y);0<x<2;2<y<4 or 0 otherwise

Find:(i)P(X+Y<3)

(ii)P(X<3/2 /Y<5/2)

In the first part I am completely lost whereas in the second part I am lost in finding limits for the required integrals.Pls help me through it