Test Review-Chapter 4 Functions

Find the value of x for the given value of y.

y = 2x - 2; y = 14

• 8

• 6

• 26

• 212

Does the equation represent a linear function?

• no

• yes

What is the definition of a function?

• inputs and outputs

• each input has only one output

• inputs have different outputs every time

• x-values and y-values

Is the relation a function? Why or why not?

• Yes, because the x-value 11 has two y-values pair with it.

• Yes, because each x-value has only one y-value paired with it.

• No, because the x-value 11 has two y-values pair with it.

• No, because each x-value has only one y-value paired with it.

Is this a function?

• yes

• no

Is this mapping a function?

• yes

• no

Give the ordered pairs in the mapping diagram.

• (-4, -2), (-2, 2), (0, 1), (2, 1)

• (-4, -2), (-2, -2), (0, 1), (2, 1)

• (-4, -2), (-2, -2), (0, 1)

• (-4, -2), (2, -2), (0, 1), (2, 1)

Which function matches the graph?

• y = -1/2x + 2

• y = 1/2x + 2

• y = 2x + 2

• y = -2x + 2

Does the graph show a linear function?

• no

• yes

A taxi service charges an initial fee of $5 plus an additional $1.50 per mile (m) driven. Which function represents the total cost (c) of a taxi ride?

• c = $5 + $1.50

• c = $1.50 + $5m

• m = $1.50 + $5c

• c = $5 + $1.50m