Identifying Functions

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

Which of the following is a function?

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Is the following a function?

• Yes, this is a function.

• No, it's not a function.

• Can't be determined with this information.

Which of the following is a function?

• A

• B

• C

• D

Is the following graph a function?

• Yes, because the vertical line test only hits one point

• Yes, because they are individual dots.

• No, because the x repeats.

• No, because it is not a line.

Which of the following is NOT a function?

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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.

Which of the following is a function?

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• 
• 
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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.

Is this is a function or not a function?

• Function
• Not a Function