Review Functions Unit Rates and Equations

The graph below shows that the cost of bananas depends on the number of pounds purchased. What is the unit rate (PRICE OF 1) banana?

• $5.00 per pound

• $1.25 per pound

• $1.00 per pound

• $0.80 per pound

Sarah has been keeping track of how many hours she practices basketball each week and thinks that the percentage of free throws she makes during practice improves the more she practices. To check this, she makes a graph comparing the number of hours she practices each week with the percentage of free throws she makes each week. Based on what she learned in her Algebra class, she realizes that her graph represents a function. Which of these could be Sarah’s graph?

• A

• B

• C

• D

Which set of ordered pairs does NOT represent a function?

• {(1, 2), (1, 3), (1, 4)}

• {(2, 3), (3, 3), (4, 3)}

• {(2, 2), (3, 3), (4, 4)}

• {(0, 0), (1, 3), (2, 6)}

In which graph is y not a function of x?

• A

• B

• C

• D

Tags

NC.8.F.1

A system of equations is shown below. y = 2x - 9 y = x + 3 What is the solution to the system of equations?

• (-1, 4)

• (4, -1)

• (12, 15)

• (15, 12)

Tags

NC.8.EE.8

Which statement is true about the system of equations shown below? y = 6x + 4 y = 2(3x + 2)

• The solution is ((-1 2/3), 0).

• The solution is ((0, 0)).

• There is no solution.

• There are infinite solutions.

Tags

NC.8.EE.8

Which graph represents a linear function?

• A

• B

• C

• D

Which equation represents a nonlinear function?

• A

• B

• C

• D

Tags

NC.8.F.3

Which is an equation of the line that passes through the points (-6, 3) and (2, 7)?

• A

• B

• C

• D

Tags

NC.8.F.4

Paula runs a bakery. She estimates that her weekly cost of rent and electricity is $250. The ingredients to bake one cake cost $4. Which equation represents the total cost to Paula’s bakery per week, y, if x number of cakes are made?

• y = 250x + 4

• y = 4x + 250

• y = 250x - 4

• y = 4x - 250