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there is no graph... but most chance it's all real numbers
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.
The graph is a region of the space on one side or another of the related function. If the inequality is strict then the related function itself is not part of the solution; otherwise it is.
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.