13. y =6-2x
14. y=7-5x
15. 2y=8-3x
16.5y=10 - 2x

1. 1200 - 540 = 660= 45%

2. 1200 x .06 = 72

3. 16.67%

4. 16.77777%

5. 136.8 and 91.2