1. Lesson 7.3 Solving Addition and Subtraction Equations 2/2/10

2. Modeling Addition Equations Activity Using Algebra Tiles Open your books to p. 326 In your groups, practice and discuss #1- 8.

3. Inverse Operations – two operations that undo each other Addition and Subtraction Multiplication and Division Equivalent Equations – equations that have the same solution

4. Subtraction Property of Equality Subtracting the same number from each side of an equation produces an equivalent equation. Whatever you do to one side of the equal sign, you MUST do to the other side.

5. Addition Property of Equality Adding the same number from each side of an equation produces an equivalent equation. Whatever you do to one side of the equal sign, you MUST do to the other side.

6. Steps to Solving Equations: 1. What are you solving for? 2. What do you have to “get rid of”? 3. How do you “get rid of it”?

7. Examples: x + 6 = -13 - 6 x = -19 y – 8 = -2 + 8 +8 3 + b – 4 = 10 + 1 y = 6 b = -9 3 + b – 43 + b + (-4) b + (-1) = -10 8 = m – 6 + 6 m – 6 = 8 m = 14 3 + b + (-4) = -10