1. Splash Screen

2. Lesson Menu Five-Minute Check (over Lesson 12–3) Main Idea and Vocabulary Example 1:Solve an Equation by Adding Key Concept: Addition Property of Equality Example 2:Solve a Subtraction Equation Example 3:Use an Equation to Solve a Problem

3. Main Idea/Vocabulary Solve subtraction equations. Addition Property of Equality

4. Example 1 Solve an Equation by Adding Solve x – 5 = 10. Method 1Use models.

5. Example 1 Solve an Equation by Adding Method 2 Use symbols. Answer: The solution is 15. Simplify. x – 5 = 10Write the equation. x = 15 + 5= + 5Add 5 to each side. Check 15 – 5 = 10

6. 1.A 2.B 3.C 4.D Example 1 A.–12 B.–6 C.6 D.12 Solve w – 3 = 9.

7. KC Interactive Lab: Solve Equations Using Addition and Subtraction

8. Example 2 Solve a Subtraction Equation Solve x – 5 = –1. Check your solution. Answer: The solution is 4. Simplify. x – 5 = –1 x = 4 + 5 = + 5 Add 5 to each side. Check x – 5 = –1 –1 = –1 Write the equation. 4 – 5 = –1 ?

9. 1.A 2.B 3.C 4.D Example 2 A.–13 B.–3 C.3 D.13 Solve d – 8 = –5. Check your solution.

10. Example 3 WEATHER The difference between the record high and low temperatures in Oregon is 173  F. The record low temperature is –54  F. What is the record high temperature in degrees Fahrenheit? Use an Equation to Solve a Problem WordsRecord high minus record low is 173°F. temperature temperature VariableLet x represent the record high temperature. Equationx – (–54) = 173

11. Example 3 x – (–54)=173 Answer: The record high temperature is 119  F. Use an Equation to Solve a Problem Simplify. x +54=173 x = 119 –54=– 54 Subtract 54 from each side. Definition of subtraction Write the equation.

12. 1.A 2.B 3.C 4.D Example 3 A.20 B.21 C.33 D.39 AGES The difference between the age of Julie’s mother and Julie’s age is 27 years. Julie’s age is 6. What is the age of Julie’s mother?

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14. Resources Five-Minute Check (over Lesson 12–3) Image Bank Math Tools Solving Equations Using Addition and Subtraction

15. 1.A 2.B 3.C 4.D Five Minute Check 1 (over Lesson 12-3) A.–16 B.–8 C.8 D.16 Solve 4 + x = 12. Use models if necessary. Check your solution.

16. 1.A 2.B 3.C 4.D Five Minute Check 2 (over Lesson 12-3) A.–17 B.–1 C.1 D.17 Solve 9 + y = –8. Use models if necessary. Check your solution.

17. 1.A 2.B 3.C 4.D Five Minute Check 3 (over Lesson 12-3) A.–6 B.–2 C.2 D.6 Solve 4 = g + (–2). Use models if necessary. Check your solution.

18. 1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 12-3) A.17 B.9 C.–9 D.–17 Solve 13 + u = 4. Use models if necessary. Check your solution.

19. 1.A 2.B 3.C 4.D Five Minute Check 5 (over Lesson 12-3) A.c – $75 = $150; $75 B.$75 + c = $150; $75 C.c – $75 = $150; $225 D.$75 + c = $150; $225 Candice has $75 in her savings account. She got money for her birthday and deposited it into her savings account. Now she has $150 in her savings account. Write and solve an equation to find how much money Candice got for her birthday.

20. 1.A 2.B 3.C 4.D Five Minute Check 6 (over Lesson 12-3) A.–6 B.2 C.4 D.6 What is the value of x in the equation 4 + x = –2?

21. End of Custom Shows