SOLUTION: How do you tell if a table or if a graph represents a function?

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Question 21857: How do you tell if a table or if a graph represents a function?
Answer by rapaljer(4551) About Me  (Show Source):
You can put this solution on YOUR website!
If each x value has a unique y value, then the graph represents a function.

In a table, if a value is given in the x table twice with separate y values, then it is NOT a function.

In a graph, we have what is called the vertical line test, in which if a vertical line crosses the graph in two or more points, then it is NOT a function.

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