1. Solving Equations By Adding or Subtracting

2. Key Terms Inverse Operations: –You can use inverse operations to solve equations. –“Undo” each other by performing the opposite operation. –Addition and Subtraction go together –Multiplication and Division go together

3. The Balancing Act _____ = _____ What you do to one side, you must do to the other side!

4. Steps for Solving Equations (+/-) Example: x + 4 = 7 Step 1. Draw a line down from the equal sign. x + 4 = 7

5. Steps for Solving Equations (+/-) Example: x + 4 = 7 Step 2 Find the variable. x + 4 = 7

6. Steps for Solving Equations (+/-) Example: x + 4 = 7 Step 3. Figure out the inverse operation needed to get the variable by itself. x + 4 = 7 This is ADDITION, so the inverse operation is SUBTRACTION

7. Steps for Solving Equations (+/-) Example: x + 4 = 7 Step 4. Perform the operation. x + 4 = 7 This is ADDITION, so the inverse operation is SUBTRACTION -4 X + 0 = 3 x = 3

8. Steps for Solving Equations (+/-) Example: x + 4 = 7 Step 5. Check. x + 4 = 7 This is ADDITION, so the inverse operation is SUBTRACTION -4 X + 0 = 3 x = 3 x + 4 = 7 (3) + 4 = 7 7 = 7

9. Solving Equations (Addition/Subtraction) X + 4 = 9 Step 1 Step 2 Step 3 Step 4 Step 5

10. Solving Equations X - 6 = 7 Step 1 Step 2 Step 3 Step 4 Step 5