Question

How do you solve the following system: `x +4y = 16, 2x – 4y = 8`?

Answer 1

`x=-24`

`y=10`

Explanation:

`x+4y=16`

`2x-4y=8`

Subtract the bottom equation from the top one so the `+4y` and `-4y` cancel each other out.

`-x=24`

`x=-24`

`x+4y=16`

`-24+4y=16`

`4y=40`

`y=10`