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Determine whether this graph is a function

Determine whether this graph is a function-example-1
User RedInk
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Explanation:

A function is such that every element in the domain has only 1 image in the range. The domain here are the x-values while the range is the y-values.

However a vertical line can cross the graph more than once. Hence the graph is not a function.

User Brooklyns
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