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The graph of a function (f:A\to B) is a set of what?

Answer and explanation

Correct answer: Ordered pairs ((x,f(x)))

Direct answer: Option A, the set of ordered pairs \(\{(x,f(x)):x\in A\}\). A function records an input and its corresponding output together. For every \(x\) in the domain, the graph contains the ordered pair \((x,f(x))\). The first coordinate tells us the input, and the second tells us the output. Option A is therefore the correct mathematical description. Option B is wrong because the domain elements alone do not tell us their outputs and are not the graph. Option C is wrong for the same reason: codomain elements alone omit the input-output pairing. Option D is clearly wrong because a function graph is not limited to the numbers 0 and 1; its pairs depend on the function and its domain. For example, if \(f(2)=5\), the graph contains \((2,5)\), not just an isolated input or output. Memory cue: a graph of a function is a collection of input-output pairs.

Related tags

FunctionsGraphOrdered-Pairs

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