Question

How do you solve the following linear system: `x+y+1 , 2x+y=7`?

Answer 1

The simplest way would be to subtract the first equation from the second

Explanation:

`2x+y=7`
`-(x+y=1)` and you will get:
`(2x-x)+(y-y)=(7-1)->x=6`

If you substitute this in one of the equations:
`x+y=1->6+y=1->y=-5`

Check with the other equation (just to make sure):
`2x+y=2*6+(-5)=7` check!