Identifying Functions

Is the following a function?

• Yes, this is a function.

• No, it's not a function.

• Can't be determined with this information.

Is the following graph a function?

• Yes, because the x never repeats.

• Yes, because they are individual dots.

• No, because the x repeats.

• No, because it is not a line.

The following is not a function because...

• There are two values that equal 2.

• x = 10 and x = 40 has two values each.

• In the f(x) column, the 5 repeats.

• This table is actually a function.

Is the following graph a function?

• Yes it is a function.

• No, it is not a function.

• There is not enough information to answer this question.

Which graph is NOT a function?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

What is the definition of function?

• Has inputs and outputs

• Every input has only ONE output

• Inputs have different outputs every time

• x-values and y-values

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.

When is a relation a function?

• When each y-value is paired with exactly one x-value.

• When each output value value has one input value.

• When each independent value is paired with two dependent values.

• When each x-value is paired with exactly one y-value.

All of the x values are called what?

• Domain

• Range

• Relation

• Function

• Yes
• No