Question

How do you solve y = 2x + 9 and 2x - y = -9?

Answer 1

There are infinite possible solutions because the equations are the same.

Explanation:

You have the equations:
`1: y=2x + 9`
`2:2x - y = -9`

Let's try to play around with the second one...
`2x - y = -9`
`-y = -9 -2x`
`y = 2x + 9`

You get the same equation as the first one!

If you plot those into the same coordinate system, you see that there are an infinite amount of possible solves.