Representing Proportional Relationships with Equations

Write the equation for this table.
K=9

• y=9

• y=9x

• y=1/9

Proportional or Not Proportional?

• Proportional

• Not Proportional

An app developer projects that he will earn $230.00 for every 100 apps downloaded.

Which of the following equations can be used to represent the proportional relationship

between the number of apps, x, and the total earnings, y?

An musician projects that he will earn $540.00 for every 150 songs downloaded. Which of the following equations can be used to represent the proportional relationship between the number of apps, x, and the total earnings, y.

• y = 150x + 540

• y = 540x + 150

• x = 3.60y

• y = 3.60x

If a school donates $5 for every student who donates $3. Write an equation representing this relationship.

• y = 3/5x

• y = 2.5x

• y = 5/3x

• y = 1.2x

If a school donates $10 for every student who donates $3. Write an equation representing this relationship.

• y = 3/10x

• y = 10/3x

• y = 1/3x

• y = 3x

Does this equation represent a proportional relationship?

• Yes

• No

Which line shows a proportional relationship between x and y?

• Line L

• Line M

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

Does this graph represent a proportional relationship?

• Yes

• No