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If \(f=\{(1,3),(2,5),(3,7)\}\), which of the following rules represents this function?

Answer and explanation

Correct answer: \(f(x)=2x+1\)

For the rule \(f(x)=2x+1\), substituting all the given first components gives \(f(1)=3\), \(f(2)=5\), and \(f(3)=7\). Thus, it matches every ordered pair in the function. Each other option gives an incorrect value for at least one input. Exam tip: test a proposed rule with every given input, not just one.

Related tags

FunctionsRelationsRule IdentificationLinear FunctionsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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