Unit 4 review

A diver had descended 64 feet underwater after 4 minutes. After 6 minutes, the diver had descended 96 feet underwater. What is the constant of proportionality that relates the number of feet descended, y, to the number of minutes, x?

• A 3/2

• B 1/16

• C 24

• D 16

A table of x- and y-values is shown.

What is the constant of proportionality that relates y to x?

• A 1/4

• B 4

• C 1/8

• D 8

At a school carnival, tickets can be purchased to participate in different activities. The table shows the total cost for different numbers of tickets. What is the constant of proportionality that relates y, the total cost in dollars, to x, the number of tickets purchased?

• A 4.00

• B 0.25

• C 1.00

• D 0.10

The cost of 3 pounds of grapes is $6.57. What is the constant of proportionality that relates the cost in dollars, y, to the number of pounds of grapes, x?

• A 6.57

• B 3

• C 2.19

• D Not here

Which graph best represents a line where each value of y is 3 more than 1/2 the value of x?

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A bowling alley charges $6.50 per game played and $4.00 for shoe rental. Which table shows the cost, c, of renting shoes and playing g games of bowling?

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Which equation represents the linear relationship between the x-values and the y-values in the table?

• y = 2x + 12

• y = 5x - 6

• y = 6x - 5

• y = -x - 11

In a city, the average cost of electricity is $0.12 per kilowatt-hour. Which graph best represents this relationship?

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A family makes homemade pickles. They pack the pickles at a rate of 80 pickles per 5 jars. Which answer choices best represent packing y pickles in x jars at that rate? Select TWO correct answers.

• A. y = 16x

• B. y = 1/16x

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A math class invented a machine to solve problems. The table shows what happens to a number when it enters and comes out the machine. Which rule describes the number pattern from the In to the Out of the math machine?

• add 10

• add 20

• multiply by 2 then subtract 5

• multiply by 3 then subtract 15