Solving systems by elimination with multiplication: 8x+7y=20 and 4x-4y=-20

If you put 0 in the place of x or y, which every one you choose, it will cancel it or and you can just divide the number next to it by the answer (-20, 20). Take it one step at a time, don't try to do both at the same time.

Jbbfubdibidbidnisbibd

The answer is the numbers between =5 and 5