there is no graph...
but most chance it's all real numbers
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If a vertical line, within the domain of the function, intersects the graph in more than one points, it is not a function.
It means that the function is not defined for a part of the domain.
A linear function would be represented by a straight line graph, so if it's not a straight line, it's nonlinear
No vertical line will intersect the graph in more than one point. The fundamental flaw is that no graph can show that it does not happen beyond the domain of the graph.
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.