Question

If three equations are consistent (a + 1)³x + (a + 2)³y = (a + 3)³

(a + 1)x + (a + 2)y = a + 3

x + y = 1, then a = 

(A)  1 

(B)  2 

(C)  −2 

(D)  3

Answer 1

Correct option (C)  -2

Since the equations are consistent, 

Therefore,