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Question: How do I determine if something is a function or a relation?

Question:How do I determine if something is a function or a relation?

James_Ed 10 Maple 2020
line plotting relation
September 25 2020
2

Hello. My question is how can I prove if an equation is a function or a relation. Now I know that vertical line test can be used, but I can't figure out how to draw a vertical line on the graph of the equation in Maple. If anyone can help, please do. Thank you.
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