To find : The curve is function or not & the domain and range of the function.
The curve of the graph is the function of and here the domain is and the range is .
Given information :
Concept used : A curve in the coordinate plane is the graph of a function if and only if no vertical line intersects the curve more than once.
The domain is the set of X coordinate and the range is the set of Y coordinate of any graph.
No vertical line intersects the curve of the graph more than once, hence the curves of the graph is the function of .
So, here the domain is and the range is .
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