**Domain of a Graph - analyzemath.com**
https://www.analyzemath.com/DomainRange/domain-of-a-graph.html

Hence, For a function f defined by its graph, the implied domain of f is the set of all the real values x along the x-axis for which there is a point on the given graph. As an example there are points on the graph below at x = - 3, - 2.5, -2, -0.5 , 2,5, 3, 3.2, 4.

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