1. Solving Equations continued Two Step Equations

2. Examine 2X + 3 = 15 What operations do you see?

3. Undo? You see two operations! Which do you undo first? Are there any symbols of grouping? 2X + 3=15 NO!

4. Undo cont. When there are no symbols of grouping, use the inverse operations for addition and subtraction first. 2X + 3 = 15 -3 -3 2X = 12

5. Undo cont.--cont. After undoing addition or subtraction, use the inverse operation for multiplication or division. 2X = 12 2 2

6. Solve X = 6

7. Check Does 2(6) + 3 = 15 Yes So it checks!!!!

8. Examine Y/3 - 4 = 6 What operations do you see?

9. Undo and Solve Y/3 - 4 = 6 + 4 +4 Y/3 = 10 Y/3(3) = 10(3) Y = 30

10. Check Always check-- Does 30/3 - 4 = 6? Yes!!!

11. Examine N + 3 = 12 2 Do You See A Symbol of Grouping???

12. Undo and Solve When grouping is used, you must undo it first!!! N + 3 = 12 2 N + 3 (2) = 12 (2) 2 N + 3 = 24 -3 -3 N = 21

13. Check Does 21 + 3 = 12 2 Yes!!!