Question

How do you solve `2x+y=7` and `x+2y=2`?

Answer 1

`x=4` and `y=-1`

Explanation:

`2*(2x+y)-(x+2y)=2*7-2`

`4x+2y-x-2y=14-2`

`3x=12`, so `x=4`

Thus,

`4+2y=2`

`2y=-2`, so `y=-1`