Question

How do you solve `3m+n=2` and `m-2n=3` using substitution?

Answer 1

`m = 1, n=-1`

Explanation:

1 ) `3m + n = 2`
2 ) `m - 2n = 3`

1(x2) ) `6m + 2n = 4`

Add them together:

`7m = 7`
`m = 1`

Sub `m` into an equation

`1 - 2n = 3`
`-2n = 2`
`n = -1`