X = 2 and y = -1

We will check by substituting the values in the given equations

(a) 2 - 2 = 0 which is true

Thus x + 2y = 0 is the equation

(b) 2 - 2 = 4 which is not true

(c) 4 - 1 = 0 which is not true

(d) 2 × 2 - 1 = 5 which is not true