So the inequality would be 77x+55y≤4000. x is the number of TV's and y is the number of microwaves. For the second part plug in 35 for x and 25 for y. So you get 77×35+55×25≤4000.
2625+1375≤4000
4000=4000 so the answer to that part is yes.
One unreasonable solution is (0,0) (TV's,microwaves) because that would mean the truck is empty. Another one is (1,71) because that would be only one TV and 71 microwaves.