Question

How do you solve `x + y = 5` and `2x - y = 4` using substitution?

Answer 1

`x=3`
`y=2`

Explanation:

`x+y=5`
`2x-y=4`
Adding up the above equations we get
`x+2x+y-y=5+4`
or
`3x+0=9`
or
`3x=9`
or
`x=9/3`
or
`x=3`=========Ans `1`
So From equation `x+y=5` we get
`3+y=5`
or
`y=5-3`
or
`y=2`=========Ans `2`