Question

If 2x + y = 7 and x + 2y = 11, then find the value of x + y.

Answer 1

2x + y = 7  ...(i)

x + 2y = 11  ...(ii)

Add equations (i) and (ii), we get

  2x + y = 7
+ x + 2y = 11
3x + 3y = 18

x + y = 6  .....(Dividing both sides by 3)