Function vs. Not a Function

Function vs. 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!

Multiple Choice

Is this considered a function?

• Yes because each x only goes to one y.

• No because some of the y values pair with multiple x values

• No because each x only goes to one y.

• Yes because all of the x values are different.

Turn and Talk:

What makes the table on the right not a function?

Virtual Students:

Discuss in the Remind chat

Multiple Choice

Is this mapping a function or not a function? 

• Function
• Not a Function

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 table a function and how can you tell?

• Yes its a function because there are not variables for missing numbers

• No it's not a function because the y value 4 repeated

• No it isn't a function because the x value 2 is repeated

• No it's not a function because the x value 5 has y values of 10 & 12

Multiple Choice

Is this mapping a function and how can you tell?

• Yes its a function cause all the numbers have lines

• No it's not a function because there a 5 in both ovals

• No it's not a function because the x value 5 has y values of 2 & 9

• No it's not a function because the y value 5 has x values of 2 & 9

If you can draw a vertical line through a graph and hit it more than once, it is not a function.

Multiple Choice

Look at this graph. Is the relation a function?

• yes

• no

Multiple Choice

Is this graph a function or not a function? 

• Function 
• Not a Function

Multiple Choice

Look at the graph. Is the relation a function?

• yes

• no

Multiple Choice

Is this mapping a function or not a function?

• Function
• Not a Function

Multiple Choice

Which of the graphs is NOT a function?

• Graph A
• Graph B
• Graph C
• Graph D

Multiple Choice

Is this a function? 

• Yes
• No

Multiple Choice

• Function
• Not a Function

Multiple Choice

Is this a function? Explain.

• Yes; it passes the horizontal line test.
• No; it is not a straight line.
• Yes; it passes the vertical line test.
• No; there is a line connecting the dots.

Multiple Choice

• Function
• Not a Function

Multiple Choice

Which graph does NOT pass the vertical line test?

• Graph 1
• Graph 2
• Graph 3
• Graph 4

Open Ended

Is this a function? Explain how you know?

Graph Credit goes to Hannah!

Poll

How do you like doing lessons like this on quizizz?

• Boring but helpful

• Don't like it

• I like it

• It's okay

• I hate having to wait after each question