Question

How do you solve `x=7y+7` and `-4x+4y=-16`?

Answer 1

I found:
`x=7/2`
`y=-1/2`

Explanation:

You can substitute for `x` the first equation into the second to get:
`-4(7y+7)+4y=-16`
`-28y-28+4y=-16`
`-24y=12`
`y=12/-24=-1/2`
now substitute back into the first equation:
`x=7(-1/2)+7`
`x=7/2`