first of all, draw your self those lines and you will see limits for integrations ...

to draw any line you need just 2 points and connect them ... (for curves you need at least 3 points)

so ....

so for y = 0 you have x = 5 , and for let's say y = 5 you will have x = 0 so you have 2 points M(5,0) N(0,5) yo you draw the line through those 2 points ... do the same thing with another 2 equations and you will get that region that you need to integrate

to see points of the intersecting, just put first equation in second and see where those 2 lines intersect , same thing with second and third and of course first and third .... and from that you will get your points of integration...

intersecting point of the first and second

put in the second

intersecting first and third

put in the third

and second and third ... x =1

Hint: There are two regions of integration.... calculate both and add them

P.S. second problem do the same way