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If the function \(f:\{1,2,3\}\to\{2,4,6,8\}\) is defined by \(f(x)=2x\), which of the following ordered pairs does not belong to the graph of \(f\)?

Answer and explanation

Correct answer: \((3,8)\)

The graph of a function contains ordered pairs of the form \((x,f(x))\). Here, \(f(1)=2\), \(f(2)=4\), and \(f(3)=6\), so \((1,2)\), \((2,4)\), and \((3,6)\) belong to the graph. For \((3,8)\), the rule would require \(f(3)=8\), but actually \(f(3)=6\). Exam tip: treat the first component as \(x\) and use the given rule to check the second component.

Related tags

Relations-FunctionsFunctions-As-RelationsOrdered-PairsFunction-RuleFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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