The given graph does not represent a function.
What is a function?
"A function is the relation between two sets. The first one is called domain and the second one is called range."
We know, the function must relate a particular value in the domain set to a particular value in the range set.
However, for the multiple values in the domain set may relate to a a single value in the range set. But the opposite will not be possible.
Here, in the graph, f(2) shows two different values.
Those are - 1 and .
Hence, it is not a function.
Learn more about a function here:
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