Understanding Functions

• Function
• Not a Function

Is this table a function or not a function? 

• Function

• Not a Function

How do you identify a LINEAR function from a table?

The Roaming Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage.  If Juanita uses x minutes of airtime, what is an equation that can be used to determine her monthly cell phone bill (C)?

• C = 0.20x + 15

• C =15 (0.20x)

• C = 15 + x + 0.20

• C = 0.20 + 15x

Bob has $150 in his savings account and saves $40 per month. Which function models his savings?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40

Which is an example of a nonlinear function?

Sara says the graph does NOT represent a function because the graph is not a straight line. Is she correct?

• Yes

• No

Frank pays $12 for each dance lesson and $30 for a membership fee. If he pays for 5 dance lessons he gets 1 free. Does the table represent this situation? Is the total cost a function of the number of dance lessons?

• Yes the table represents the situation & yes this is a function.

• Yes the table represents the situation. No this is not a function

• No the table does not represent the situation. Yes this is a function.

• No the table does not represent the situation & no this is not a function.

Which set of values is a function?

• (9,5) (10,5) (9,-5) (10,-5)

• (3,4) (4,-3) (7,4) (3, 8)

• (6,-5) (7, -3) (8, -1) (9, 1)

• (2, -2) (5, 9) (5, -7) (1, 4)

Is this graph a function or not a function? 

• Function 

• Not a Function