positive = greater than 0.
Therefore we have the inequality:
|add 7 to both sides

It is not a right triangle
They give you the y-value in an (x, y) ordered pair. So you plug in 8 where the y is and solve.
- 4x - 8 = 24
Add 8 to each side
- 4x = 32
Divide each side by - 4
x = - 8
So your ordered pair is (- 8, 8).