1. Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes

2. Warm Up
Solve each equation.
1. x + 7 = 22
x = 105
3. 16 = x + 9
4. 23 = x + 4
x = 15
x = 87
x = 7
x = 19

3. Problem of the Day
Bruce has 25 CDs remaining after giving 14 to John, 17 to Mary, and 25 to Sue. How many CDs did he begin with? 81

4. Florida State Standards
MAFS.6.A.3.2 Write [and] solve…one-step linear equations…

5. When Theodore Roosevelt became president of the United States, he was 42 years old. He was 27 years younger than Ronald Reagan was when Reagan became president. How old was Reagan when he became president?

6. = = – – Let a represent Ronald Reagan’s age. Ronald Reagan’s age 27
Theodore Roosevelt’s age – = – = a 27 42
a – 27 = 42
+ 27
+ 27
a = 69
Ronald Reagan was 69 years old when he became president.

7. Additional Example 1A: Solving Subtraction Equations
Solve y – 23 = 39. Check your answer.
y – 23 = 39
23 is subtracted from y.
+ 23
+ 23
Add 23 to both sides to undo the subtraction.
y = 62
Check y – 23 = 39
62 – 23 = 39 ?
Substitute 62 for y in the equation.
39 = 39 ? 
62 is the solution.

8. Additional Example 1B: Solving Subtraction Equations
Solve 78 = s – 15. Check your answer.
78 = s – 15
15 is subtracted from s.
+ 15
+ 15
Add 15 to both sides to undo the subtraction.
93 = s
Check 78 = s – 15
78 = 93 – 15 ?
Substitute 93 for s in the equation.
78 = 78 ? 
93 is the solution.

9. Additional Example 1C: Solving Subtraction Equations
Solve z – 3 = 12. Check your answer.
z – 3 = 12
3 is subtracted from z.
+ 3
+ 3
Add 3 to both sides to undo the subtraction.
z = 15
Check z – 3 = 12
15 – 3 = 12 ?
Substitute 15 for z in the equation.
12 = 12 ? 
15 is the solution.

10. Additional Example 1D: Solving Subtraction Equations
Solve 7 = b – 7. Check your answer.
7 = b – 7
7 is subtracted from b.
+ 7
+ 7
Add 7 to both sides to undo the subtraction.
14 = b
Check 7 = b – 7
7 = 14 – 7 ?
Substitute 14 for b in the equation.
7 = 7 ? 
14 is the solution.

11. Check It Out : 1A
Solve the equation. Check your answer.
57 = c – 13
57 = c - 13
70 = c

12. Check It Out : 1B
Solve the equation. Check your answer.
g - 62 = 14
g - 62 = 14
g = 76

13. Check It Out : 1C
Solve the equation. Check your answer.
49 = n - 11
49 = n - 11
60 = n

14. Check It Out : 1D
Solve the equation. Check your answer.
p - 38 = 40
p = 40
p = 78

15. Check It Out : 1E
Solve the equation. Check your answer.
Floridian Nancy Rios represented the United States in windsurfing at the 2008 Olympics. In 10 races, her best finish was 22nd place. Her best finish was 5 places ahead of her worst finish. Solve the equation w - 5 = 22 to determine her worst finish.
w - 5 = 22
w = 27
Her worst finish was 27th place.

16. Check It Out : 1F
The Great Bay Scallop Search is one of Tampa Bay’s most popular volunteer events each year. Volunteers snorkel to count scallops and document the population trend.
In 2005, the search resulted in only one scallop! This was 26 fewer scallops than were found in Write and solve a subtraction equation to find the number of scallops found in 1998.
s =
w = 27
27 scallops were found in 1998.

17. Check It Out : 1G
The Great Bay Scallop Search is one of Tampa Bay’s most popular volunteer events each year. Volunteers snorkel to count scallops and document the population trend.
In 2007, 555 scallops were found. This Shattered the previous high by 476 scallops. Before 2007, what was the previous high number of scallops found?
79 scallops

18. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

19. Lesson Quiz
1. x – 9 = 21
2. 14 = x – 3
3. x – 7 = 11
4. 16 = x – 14
5. x – 9 = 11
x = 30
x = 17
x = 18
x = 30
x = 20
6. Susan is taller than James. The difference in their heights is 4 inches. James is 62 inches tall. How tall is Susan?
66 inches

20. Lesson Quiz for Student Response Systems
1. Solve the equation x – 17 = 36.
A. x = 19
B. x = 21
C. x = 36
D. x = 53

21. Lesson Quiz for Student Response Systems
2. Solve the equation 20 = x – 6.
A. x = 14
B. x = 20
C. x = 26
D. x = 40

22. Lesson Quiz for Student Response Systems
3. Solve the equation y – 16 = 33.
A. y = 59
B. y = 49
C. y = 23
D. y = 17

23. Lesson Quiz for Student Response Systems
4. Solve the equation 52 = y – 23.
A. y = 29
B. y = 31
C. y = 75
D. y = 84

24. Lesson Quiz for Student Response Systems
5. Solve the equation x – 15 = 22.
A. x = 43
B. x = 37
C. x = 13
D. x = 7

25. Lesson Quiz for Student Response Systems
6. During an NBA playoff game, Brand scored 12 points more than Cassell. If Cassell had 33 points how many points did Brand score?
A. 45 points
B. 33 points
C. 21 points
D. 12 points