1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 3-2)

A. 21

B. 5

C. –5

D. –21

The sum of a number and 8 is –13. Find the number.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 3-2)

A. s – 17 = 152; s = 135 mph

B. 17 + s = 152; s = 135 mph

C. s – 17 = 152; s = 169 mph

D. 17 + s = 152; s = 169 mph

Using the table, write and solve an equation to determine Dale’s top speed at the racetrack if Dale’s top speed was 17 mph less than Andy’s.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 3-2)

A. h = 1,582 – 34

B. 1,582 – h = 34

C. 1,582 + 34 = h

D. 34 = h + 1,582

The combined ages of the students in the 7th grade class at Sunnydale Middle School is 1,582. The combined ages of the students in the 8th grade class is 34 more than the combined ages of the students in the 7th grade class. Which equation can help you find the combined ages of the students in the 8th grade class?

Main Idea and Vocabulary

Key Concept: Division Property of Equality

Example 3:Real-World Example

Example 4:Real-World Example

• Formula – an equation that shows the relationship among certain quantities. EX: Distance Formula (d=rt) which gives the relationship among the distance d, rate r, and time t.

• Solve multiplication equations (2.8.8E) (M7.D.2.1)

BrainPOP: Solving Equations

1. D

MAIL Serena went to the post office to mail some party invitations. She had $6.15. If each invitation needed a $0.41 stamp, how many invitations could she mail?

Words Total is equal to cost of each stamp times number of invitations mailed.

Variable Let n represent the number of invitations mailed.

Equation 6.15 = 0.41n

Answer: Serena could mail 15 invitations.

6.15 = 0.41n Write the equation.

15 = n 6.15 ÷ 0.41 = 15

1. A

2. B

3. C

4. D0% 0%0%0%

A. 57 mph

B. 58 mph

C. 60 mph

D. 62 mph

TRAVEL Jordan drove 273.6 miles in 4.8 hours. What was Jordan’s average speed?

SWIMMING Ms. Wang swims at a speed of 0.6 mph. At this rate, how long will it take her to swim 3 miles?

Answer: It would take Ms. Wang 5 hours to swim 3 miles.

You are asked to find the time t it will take to travel a distance d of 3 miles at a rate r of 0.6 mph.

d = rt

3 = 0.6t

1. A

2. B

3. C

4. D0% 0%0%0%

A. 1.75 pounds

B. 2.5 pounds

C. 2.75 pounds

D. 4.11 pounds

COOKIES Debbie spends $6.85 on cookies at the bakery. The cookies are priced at $2.74 per pound. How many pounds of cookies did Debbie buy?

REVIEW

Solve each equation.

1. y + 8 = -2

2. x – 7 = -2

3. 20 = z + 23

4. Write an algebraic expression for the phrase the product of –3 and y.

-10

5

-3

-3y

End of the Lesson

Five-Minute Check (over Lesson 3–2)

Image Bank

Math Tools

Solving Equations Using Models

Perimeter

Solving Equations Two-Step Equations