Unit 4 Review

In Mr. Arthur's mathematics class, students were given a rectangular greeting card. The table below shows the length and area of each card. Which equation represents the rate of change between the area of a card, y, with a side length of x?

• y = 5x

• y = 2x

• y = 10x

• y = x + 5

A pool is filling up with water at a rate of 25 gallons per minute. Which graph best represents y, the amount of water after x minutes?

• A

• B

• C

• D

Pickles cost $2.10 per jar. Which equation best represents y, the total cost of x jars of pickles?

• y = 2.10 + x

• x = 2.10 + y

• y = 2.10x

• x = 2.10y

What is the constant of proportionality that relates the distance traveled, y, to the elapsed time in seconds, x, represented by this data?

• 6

• 5

• 4

• 3

Dr. Jack-O bought 3 pumpkins for $12.66. What is the constant of proportionality that relates the cost in dollars, y, to the number of pumpkins, x?

• $4.22

• $3.50

• $5.00

• $4.50

Agent Peely received a gift card for $20.00 to use for an online App Market to buy apps for his tablet. What is the balance remaining on Agent Peely's gift card after purchasing 5 apps, each costing $1.50?

• $12.50

• $10.00

• $7.50

• $5.00

The table below shows the relationship between h, the number of hours Katy worked, and w, the amount of wages she earned. Which equation represents the relationship between h, the number of hours Katy worked, and w, the total wages she earned, in the table?

• $ w = 8.75h

• $ w = 10h

• $ w = 7.5h

• $ w = 9h

A store sells sweaters for $25 each. Pants sell for $50 each. Katie is buying 3 pants and x sweaters. Which equation can be used to find y, the total price Katie must pay in dollars?

• y = 25x + 150

• y = 50x + 75

• y = 25x + 50

• y = 50x + 25

Which equation best represents the relationship between x and y in the graph?

• A

• B

• C

• D

What is the constant of proportionality that relates garden size, y, to the map size, x?

• 1

• 2

• 0.5

• 3