1. 3.3 Solving Equations Using Addition or Subtraction

2. Equations Have an equal sign Directions: Solve Solving means to find the value of the variable by isolating it Do inverse operations to isolate the variable

3. Inverse Operations The Inverse of Addition is: Subtraction The Inverse of Subtraction is: Addition

4. The Addition Property of Equality: if a = b, then a + c = b + c

5. Example 1: a - 5 = -2 +5 +5 a = 3

6. The Subtraction Property of Equality: if a = b, then a - c = b - c

7. Example :2 19 = k + 7 -7 -7 12 = k

8. Example 3: a + 1.5 = 3.2 -1.5 -1.5 a = 1.7 when you add/sub decimals Remember to line up the decimal place.

9. Example 4: x + 6.8 =5.2 -6.8 -6.8 __________________ X= -1.6

10. Example 5:

11. Example 6: When you add/sub fractions you need a common denominator

12. Example 7 : Remember to turn all mixed numbers as improper fractions

13. Homework: Page 100 (21, 5-17) all