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If the domain of the function \(f(x)=x+1\) is \(A=\{2,4,6\}\), which of the following ordered pairs belongs to the graph of the function?

Answer and explanation

Correct answer: (4,5)

Every pair in the graph of a function has the form \((x,f(x))\). Here, \(f(4)=4+1=5\), so \((4,5)\) is correct. In option B, the function value is incorrect; in option C, the input and output are reversed; and for option D, \(f(6)=7\), not 8. Exam tip: substitute the first coordinate into the function and check whether it gives the second coordinate.

Related tags

FunctionsRelationsGraph Of A FunctionOrdered PairsDomain And RangeFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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