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Answer/Step-by-step explanation:

If the vertical line touches the graph at more than one point, then the graph is not a function.Use the vertical line test to determine whether or not a graph represents a function. If a vertical line is moved across the graph and, at any time, touches the graph at only one point, then the graph is a function.  

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Yes it's a function

As per the defination of function.

If every domain of the relationship has an unique range that's a function

  • f(x)=y

So

Here

  • f(0)=0

And rest also have unique range

So it's a function

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