Writing and interpreting functions

What is the value of x when y = 10 in the equation y = 4x - 2?

• x = 10

• x = 3

• x = 4

• x = 5

What is the function notation for the coordinate point (3, 5)?

• f(3) = 5

• f(5) = 3

• f(3, 5)

• f(3) = 8

Given the graph find $f\left(x\right)=5$  . Write your answer in function notation.

• f(0)=5

• f(0)=0

• f(5)=0

• f(0)=1

Given y = -4x + 9, if x = 2 what is y? (just write the number)

Mathematical Equivalence

OFF

If x = 4, the equation y = -5x, what is the value of y?

Function f gives the temperature, in degrees Celsius, t hours after midnight.

Choose the equation that represents the statement "At 1:30 p.m., the temperature was 20 degrees Celsius".

• f(1:30)=20

• f(1.5)=20

• f(13:30)=20

• f(13.5)=20

Answer explanation

using military time, 1:30 is 13.5 hours after midnight (those are your key words). 30 minutes is 1/2 of 1 hour.

Tyler filled up their bathtub, took a bath, and then drained the tub. The function B gives the depth of the water, in inches, t minutes after they began to fill the bathtub.

Explain the meaning of

B(9) = 11

• The depth of the water at 11 minutes was 9 inches.

• The depth of the water at 9 minutes was 11 inches.

• After 11 minutes, the water rose 9 inches.

• The water was 9 inches deep after 11 minutes.

y = -2x + 13 when x = 6

• -3

• -1

• 1

• 3