Cory and Everett have collected model cars since the third grade. Cory has 80 model cars in his collection, which is 25% more than Everett has. How many model cars does Everett have?

-7x-2y=-13
x-2y=11

STEPS:
1. Take the equation x-2y=11 and add 2y to the other side
2. You should now have x=2y+11
3. Use the equation -7x-2y=-13 and add the x in
4. Your problem should now look like: -7(2y+11)-2y=-13
5.Distribute: -14y-77-2y=-13
6. Add 77 to the other side and combine like terms: -16y=64
7. Divide 64 by -16
8. You should now have y=-4
9. Now go back to the equation: x-2y=11
10. Add the y in: x-2(-4)=11 which gives you: x+8=11
11. Subtract 8 from 11
12. x=3
13. Final Solution: (3,-4)