function or not a function

Front

What is a function?

Back

A function is a relation where each input has exactly one output.

Front

What is not a function?

Back

A relation where at least one input has more than one output.

Front

What is the vertical line test?

Back

A method to determine if a graph represents a function; if a vertical line crosses the graph more than once, it is not a function.

Front

Example of a function: (1, 2), (2, 3), (3, 4)

Back

This is a function because each input has one output.

Front

Example of not a function: (1, 2), (1, 3), (2, 4)

Back

This is not a function because the input '1' has two outputs.

Front

What does it mean if a graph passes the vertical line test?

Back

It means the graph represents a function.

Front

What does it mean if a graph does not pass the vertical line test?

Back

It means the graph does not represent a function.

Front

Can a function have the same output for different inputs?

Back

Yes, a function can have the same output for different inputs.

Front

What is an example of a function in real life?

Back

A vending machine is a function; each button (input) gives one specific item (output).

Front

What is an example of not a function in real life?

Back

A person with multiple phone numbers for the same contact is not a function.