Proportional Relationships - Unit Test

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1. Which situation is best described by the graph shown?

• A. JJ purchases chips for $0.75 per bag.
• B. Mark buys packs of gum for $1.50 each.
• C. Paula pays $0.50 per ticket at the fair.
• D. Franco purchases flowers for $3.00 each.

2. Find the constant of proportionality in the graph below.

• A. 9
• B. 4
• C. 3
• D. 1.5

3. As the x-value increases by 20, the y-value increases by 10. Which of the following equations represents the relationship between the x and y-values?

• A. y = 2x
• B. y = x + 10
• C. y = 0.5x
• D. y = 10x

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5. 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?

• A. y = 100x + 230
• B. y = 230x + 100
• C. x = 2.30y
• D. y = 2.30x

6. The table shows the relationship between x-values and y-values. Which of the following statements is true?

• A. The constant of proportionality is 5.
• B. The y-intercept is 20.
• C. This is an example of a non-proportional relationship.
• D. The rate of change is 7.5.

7. The graph below shows the relationship between the amount of money in Sarah’s savings account over a period of time. Which of the following statements is NOT true about the relationship?

• A. After 5 weeks, Sarah has $100 in her account.
• B. If Sarah has a balance of $60, then 7 weeks have passed.
• C. The relationship is proportional.
• D. The situation can be represented by the equation y = 200 – 20x.

8. The table below shows the relationship between the number of miles traveled, x, and the gallons of gas used, y. Which of the following equations best represents the relationship?

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