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Graph of a function

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Drawing Graphs of Functions (GMAT/GRE/CAT/Bank PO/SSC CGL) | Don't Memorise

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Graphs of Functions | Illustrations and Equations

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How to Write a Function From a Graph : Math Made Easy

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Graph functions and relations

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Evaluating composite functions: using graphs | Mathematics III | High School Math | Khan Academy

In mathematics, the graph of a function f is, formally, the set of all ordered pairs (x, f ), and, in practice, the graphical representation of this set. If the function input x is a real number, the graph is a two-dimensional graph, and, for a continuous function, is a curve. If the function input x is an ordered pair (x1, x2) of real numbers, the graph is the collection of all ordered triples (x1, x2, f ), and for a continuous function is a surface.