2. Transparency 2 Click the mouse button or press the Space Bar to display the answers.

3. Splash Screen

4. Example 2-2c Objective Solve addition equations

5. Example 2-2c Vocabulary Inverse operations Operations which undo each other add/subtract Multiply/divide

6. Example 2-2c Vocabulary Solve Find the value of the variable that results in a true sentence

7. Lesson 2 Contents Example 1Solve an Equation by Subtracting Example 2Solve an Equation Using Zero Pairs

8. Example 2-1a Write the equation. x + 4 Ask “what is being done to the variable?” The variable is being added by 4 Do the inverse on each side to “undo the addition 1/2 Bring down x + 4 Subtract 4 - 4 Bring down = 5 Subtract 4 = 5 - 4

9. Example 2-1a Bring down x x + 4 1/2 - 4= 5 - 4 x Combine “like” terms + 0 Bring down = = Combine “like” terms 1 Use the Identity Property of Addition to add x + 0 x = 1 Answer:

10. Example 2-1c Answer: 1/2

11. Example 2-2a Write the equation. x +11 Ask “what is being done to the variable?” The variable is being added by 11 Do the inverse on each side to “undo the addition 2/2 Bring down x + 11 - 11 = 7 - 11 Subtract -11 Bring down = 7 Subtract -11

12. Example 2-2a x + 11 2/2 - 11 = 7 - 11 Bring down x x Combine “like” terms + 0 Bring down = = Combine “like” terms -4 Use the Identity Property of Addition to add x + 0 x = -4 Answer:

13. Example 2-2c Answer: x = –6 * 2/2

14. End of Lesson 2 Assignment Lesson 9:2Solving Addition Equations10 - 31 All