Question

choose correct alternative
If 49x - 57y = 172 and 57x - 49y = 252 then x - y = ……… ?

(A) 80 (B) 4 (C) 10 (D) 8​

Answer 1

Answer:

(C) 10

Step-by-step explanation:

57x - 49y = 252. Eqn 1

49x - 57y = 172 Eqn2

On subtracting Eqn 1 and 2 qe get

8x + 8y = 80 [divide by 8 on bothsides]

x + y =10