I believe this is a trial and error type of question.
1) 2x + y > 8
Plug in the coordinate.
2(3) + 2 > 8
6 + 2 > 8
8 > 8
This is not true because 8 is not greater than 8.
Acceptable answers would be:
8 = 8 or 8 ≥ 8
2) 2(-1) + 9 > 8
-2 + 9 > 8
7 > 8
False.
3) 2(5) + (-1) > 8
10 - 1 > 8
9 > 8
This statement is true, therefore, (5, -1) is a correct solution to the problem.
4) 2(4) + 3 > 8
8 + 3 > 8
11 > 8
This is also true since 11 is greater than 8. (4, 3) is another solution to the inequality.