Devon is having difficulty determining if the relation given in an input-output table is a function.

Marco explains to him that in order to tell if the relation in the table is a function, Devon needs to check if any of the output values are repeated. If they repeat and have different input values, the relation is not a function.

Instructions:

Decide if you think Marco is correct or incorrect.
Answer the following depending on how you answered #1.
If you think Marco is correct, summarize Marco's reasoning in your own words.
If Marco is incorrect, explain what is wrong with Marco's reasoning and provide an example of a function.

What to submit:

3-4 sentences answering #2a or #2b depending if you agree or disagree with Marco.