Course 2, Lesson 1-5 Use the four-step plan to solve each problem. 1. A comic book store took in...

Course 2, Lesson 1-5

Use the four-step plan to solve each problem.

1. A comic book store took in $2,700 in sales of first editions during November.

December sales of first editions are expected to be double that amount. If

the first editions are sold for $75 each, how many first editions are expected

to be sold in December?

2. Nolan is selling coupon books to raise money for a class trip. The cost of the

trip is $400, and the profit from each coupon book is $15. How many

coupon books does Nolan need to sell to earn enough money to go on the

class trip?

3. Porter’s Café made a $6,000 profit during January. Ms. Porter expects

profits to increase $500 per month. In what month can Ms. Porter expect her

profit to be greater than his January profit?13

Course 2, Lesson 1-5

ANSWERS

1. 72

2. 27 coupon books

3. May

HOW can you show that two objects are proportional?

Ratios and Proportional Relationships

Course 2, Lesson 1-5

Ratios and Proportional Relationships

Course 2, Lesson 1-5 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

• 7.RP.2Recognize and represent proportional relationships between quantities.

• 7.RP.2aDecide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.

Mathematical Practices

1 Make sense of problems and persevere in solving them.

2 Reason abstractly and quantitatively.

3 Construct viable arguments and critique the reasoning of others.

4 Model with mathematics.

• To determine whether two quantities are proportional by graphing them on a coordinate plane

Ratios and Proportional Relationships

Course 2, Lesson 1-5

Ratios and Proportional Relationships

Course 2, Lesson 1-5

•coordinate plane •quadrants•ordered pair•x-coordinate•y-coordinate•y-axis•origin•x-axis

How did what you learned today help you answer the

HOW can you show that two objects are proportional?

Course 2, Lesson 1-5

Ratios and Proportional Relationships

How did what you learned today help you answer the

HOW can you show that two objects are proportional?

Course 2, Lesson 1-5

Ratios and Proportional Relationships

Sample answers:• By recognizing that the graph of a proportional

relationship is a straight line that passes through the origin

Describe how you can tell whether a relationship between two quantities

is proportional.

Ratios and Proportional Relationships

Ratios and Proportional Relationships

Course 2, Lesson 1-5