Question

If 49x – 57y = 172 and 57x – 49y = 252 then x + y = ?

विकल्प

• 80

• 0

• 10

• 8

Answer 1

10

Explanation:

49x - 57y = 172
57x - 49y = 252
-      +          -     
- 8x - 8y = - 80

∴ x + y = `(-80)/(-8) = 10`