Which ordered pair is in the inverse of the relation given by x^2y + 5y = 9?

Question

(A) (2, 1)
(B) (-2, 1)
(C) (-1, 2)
(D) (2, -1)
(E) (1, -2)

Answer 1

y^2 x + 5 x = 9
if x = 1, y^2 = 4 so y =+/- 2
(1,-2) works

Answer 2

since (1,-2) satisfies the relation,
(-2,1) satisfies the inverse.