Identifying and Comparing Functions Quiz Review

Does the table represtent a function?

• Yes

• No

Does the graph represent a function?

• Yes

• No

Is the equation

 $y\ ^2-x^2=16$  
a function?

• Yes

• No

Which correctly explains whether or not the graph shown is a function?

• Yes; the graph passes the horizontal line test.

• Yes; the graph passes the vertical line test.

• No; the graph does not have a constant rate of change.

• No; each input on the graph has more than one output.

The list of ordered pairs represents a function:

(12, 6), (3, 1), (2, -2), (5, 10), (-8, -4), (__,__)

What could be the missing ordered pair?

• (2, 1)

• (12, 7)

• (-8, 8)

• (-3, -4)

Rita works at a gym where she gets paid $450 each week plus $15.50 for any new gym memberships she sells. If y represents the total pay per week and x represents the number of new memberships sold, which of the following equations represents a higher rate per membership sold?

• y = 31/3 x + 500

• y = 15x + 425

• y = 33/2 x + 425

• y = 15.05x + 475

The Smith's are hiring painters, and the painting companies they've narrowed it down to charge based on the number of square feet. Company A charges $2.25 per square foot. Company B's rates are shown in the table. Which company would give their family the lowest cost per square foot?

• Company A

• Company B

The gas mileage of Caiden's vehicle can be represented by the equation   y=16.2x  where x is the numer of gallons of gas and y is the number of miles. Ethan's gas mileage is shown in the graph. Who's vehicle gets the higher rate of miles per gallon?

• Caiden

• Ethan

Which correctly describes the graph?

• Non-linear; not a function

• Non-linear; function

• Linear; function

• Linear; not a function

Which of the following equations represents a linear function?

• y = 15/x

• y = 2x³ + 2

• y = 1/2x + 9

• y = x²