1. Addition and Subtraction Equations Created by Christine Berg Edited by V Hamilton

2. Inverse Operations: Addition is the opposite of subtraction and vice versa

3. Models = Variable = 1 = -1

4. Subtraction Property of Equality You can subtract the same value from both sides of an equation

5. Example: Arithmetic: 5 = 5 5 – 2 = 5 – 2

6. Example: Algebraic: If a = b then a – c = b – c

7. Example: x + 2 – 2 = 4 – 2 x = 2 x + 2 = 4

8. Example:

9. Example: Subtract 2 from each side

10. Example: x = 2

11. Addition Property of Equality You can add the same value to both sides of an equation

12. Example: Arithmetic: 9 = 9 9 + 2 = 9 + 2

13. Example: Algebraic: If a = b then a + c = b + c

14. Example: x - 2 + 2 = 4 + 2 x = 6 x - 2 = 4

15. Example:

16. Example: x – 2 + 2 = 4 + 2 ++

17. Example: x = 6

18. In your own words words write what you learned from this lesson.