How can you show an infinite number of possible answers?

Egg salad: $5 per pound

1 pound for $5

3 pounds for $15

20 pounds for $100

In this lesson you will learn to display all the possibilities in a

proportional relationship by graphing.

Let’s ReviewLet’s Review

Proportional relationships

30 miles every 2 hours

2 pounds cost $6

Let’s ReviewA Common Mistake

115

2

12

8

4

Use equal steps for a graph’s scales!

(3, 11)

(2, 5)

(1, 2)

1 2 3

Let’s ReviewCore Lesson

2 pounds for $6Weight

(lb.)Cost ($)

2

4

6

6

1218

Let’s ReviewCore Lesson

Weight (lb.)

Cost ($)

2

4

6

6

1218

Cost

($

)

Weight (lb.)

Let’s ReviewCore Lesson

Dis

tance

(m

i.)

Time (hr.)

30 miles in 2 hours

45 miles in 3 hours

In this lesson you have learned to display all the possibilities in a proportional relationship by

graphing.

Let’s ReviewGuided Practice

Graph the proportional relationship “3 pounds of egg salad for $2.”

Let’s ReviewGuided Practice

State in words the proportional relationship shown here.(There are many correct answers!)

x

y

Dis

tance

(ft

.)

Time (min.)

Let’s ReviewGuided Practice

Multiple choice: Which graph shows a proportional relationship?

A. B. C. D.

Let’s ReviewExtension Activities

Graph a proportional relationship with negative quantities, like “a loss of 3 dollars per day.” Discuss why the graph is in the fourth quadrant.

Let’s ReviewExtension Activities

Graph a relationship that is not proportional. Discuss why it is not.

Side of a square (in.)

Area of the square (in.2)

1

2

3

4

Let’s ReviewQuick Quiz

Graph the proportional relationship “15 miles in 3 hours.”

Let’s ReviewQuick Quiz

State in words the proportional relationship shown here.(There are many correct answers!)

Cost

($

)

Weight (ounces)