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`