Identifying Functions

Describing Functions

Let statements

Equations

Word Problems

100

Is this relationship a function?

yes, this is a function because every input has one output.

100

What is the rate of change?

60

100

Define the x and y variables.

let x = the number of hours

let y = the cost

100

y=25x+50

100

Nicole will earn $28 babysitting.

200

Is this relationship a function?

No, this is not a function because an input of 8 has outputs of 21 and 34.

200

What is the slope and y-intercept?

m=-1/2 and b=1

200

Define the x and y variables.

let x = the number of days

let y = the height of the plant

200

y=1.5x+5

200

The plumber will earn $425.

300

Is this relationship a function?

No, this is not a function because an input of 70 has two outputs.

300

What is the slope and y-intercept?

m=3 and b=-4

300

Define the x and y variables.

let x = the number of seconds

let y = the plane's altitude

300

y=-5x+8500

300

There is 255 gallons of water in the tank.

400

Is this relationship a function?

yes, this is a function because every input has one output.

400

Who types faster? *Justify your answer!!*

Morgan types 15 words per minute.

Brian types 20 words per minute.

Brian types faster than Morgan.

400

Define the x and y variables.

let x = the number of months

let y = the cost of internet service

400

y=18x+45

400

It costs $200 to rent the canoe for 6 hours.

500

Is this relationship a function?

No, this is not a function because an input of 4 has outputs of 2 and -2.

500

Which plan is cheaper if a student needs to be tutored for 6 hours?

Plan 2

500

Define the x and y variables.

let x = the number of months

let y = the cost of the gym membership

500

y=33x+30

500

Attorney A charges $4,150 for 26 hours.

Attorney B charges $4,700 for 26 hours.

Attorney A has the better price.

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