Function, not a Function

Relations (Function/Not a Function)

In a Function, each input (x value) has EXACTLY ONE output (y value).

It is perfectly okay for different x values to go to the same y value. That can still count as a function!

​Each INPUT is listed ONLY one time in the table.

​Each INPUT is listed ONLY one time in the table.

Multiple Choice

Is this a FUNCTION?

• YES

• NO

​FUNCTION

​NOT a function

​

​ Each x value corresponds to only one y value​

Multiple Choice

Is this a FUNCTION?

• YES

• NO

Multiple Choice

Is this mapping a function or not a function? 

• Function

• Not a Function

Multiple Choice

Is the relation a function? Why.

• 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.

Multiple Choice

Is this set of ordered pairs a function and how can you tell?

• Yes its a function because no y values repeat

• No it's not a function because there are negative numbers

• No it isn't a function because an x value repeats but has different y values 

• No it isn't a function because an y value repeats but has different x values

Multiple Choice

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)

​Y values can repeat?!?!

​YEP!

​Vertical Line Test

​aka "pencil test"

Multiple Choice

Which does NOT pass the Vertical Line Test?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

Multiple Choice

Is this a function?

• YES

• NO

Multiple Choice

Is this a FUNCTION?

• YES

• NO

Fill in the Blank

One test to see if a graph is a FUNCTION is the ________ Line Test, also known as the "Pencil Test."

Multiple Choice

Which of these graphs IS a function?

• A

• B

• C

• D

Multiple Choice

Which of these graphs IS a function?

• A

• B

• C

• D

Multiple Choice

Which graph IS a function?

• A

• B

• C

• D