Function or Not a Function Tables

How do you determine if a relation is a function? 

• The vertical line test crosses more than one point on the graph.

• The same y-values are mapped from the same x-values.

• The vertical line test crosses only one point on the graph.

• Each input is related to more than one output.

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.

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 these tables represent a function?

• A

• B

• C

• D

Which set of values is not a function?

• (9,5) (10,5) (4,-5) (8,-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)

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

• Function
• Not a Function

• Function
• Not a Function

Choose the best answer that describes the image.

• Function

• Relation

• Function and Relation

• Neither a relation nor a function

A relation is a function when.......

• the input is only with one output.

• the input is repeating with different output.

• the output is repeating.

• the input is repeating.