Function and Non-Function

Does the equation y=3x-5 represent a function?

• Yes

• No

• No idea

What do you call the image?

• Graph

• Table

• Ordered Pairs

• Mappiing

• It is a function because no vertical lines hit it twice.

• It's not a function because a vertical line hits it twice.

• It's not a function because no vertical lines hit it twice.

• It is a function because a vertical line hits it twice.

• It is a function because each x has only one y.
• It's not a function because an x has multiple y's.
• It's not a function because a y has multiple x's.
• It is a function because each y has only one x.

In order to be a function the following must be true.

• each x value has only one y value

• each y value has only one x value

• each x  has only one y & each y has only one x 

• each x and y are equal

Which of the following statements is true about a function?

• A graph passes the vertical line test

• A mapping has two arrows leaving an x value.

• A table has repeated x's with different y values

• All of these are true.

Is this graph a function and how can you tell?

• Yes its a function cause it doesn't cross itself

• No it's not a function because it goes through the origin

• No it's not a function because the x value 4 has y values of  -2 & 2

• No it's not a function because the y value 4 has x values of  -2 & 2

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

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

Which of the following guarantees a table will not be a function?

• x value repeats

• y value repeats

• x value repeats and has different y values

• y value repeats and has different x values