Question

How do you solve the system `9a+2b=10` and `9a-2b=10`?

Answer 1

`a=10/9`
`b=0`

Explanation:

I would add the two equation together as:
`{9a+2b=10`
`{9a-2b=10`
`----=-`
`18a+//=20`

So that `a=20/18=10/9` and using this value into the first equation:
`9*10/9+2b=10`
`b=0`