Question

How do you solve `x+3y=8` and `y=2x-9` using substitution?

Answer 1

I found:
`x=5`
`y=1`

Explanation:

You can use the second equation substituting it, for `y`, into the second:
`x+3(color(red)(2x-9))=8`
`x+6x-27=8`
`7x=35`
`x=35/7=5`
We substitute this value of `x` into the second equation to get:
`y=(2*5)-9=10-9=1`