Name the property illustrated by each statement.
| 1. 0 + b = b | 2. If x + y = 3, then 3 = x + y. |
| 3. x = x | 4. 4 · 1 = 4 |
| 5. 1 · y = y | 6. 6 = 6 |
| 7. 0 = 0 · 12 | 8. 5 = 5 + 0 |
| 9. If 12 = 17 - 5, then 17 - 5 = 12. | 10. 7(8 - 3) = 7(5) |
| 11. w + (4 + 6) = w + 10 | 12. x + 2 = x + 2 |
| 13. (6 + 9)x = 15x | 14. (7 - 4)(6) = 3(6) |
| 15. xyz = xyz | 16. 8 + 5 = (4 + 4) + 5 |
| 17. If 6 + 3 = 9 and 9 = 3(3), then 6 + 3 = 3(3) |
Evaluate each expression. Name the property used in each step.
| 18. 2 + 6(9 - 32) - 2 |
| 19. 5(13 - 39 ·3) + 7 · 1 |
| 20. 7(16 · 42) |
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