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If \(f(x)=kx-3\) and \(f(4)=17\), what is the value of \(k\)?

Answer and explanation

Correct answer: 5

Substituting \(x=4\) into \(f(x)=kx-3\) gives \(f(4)=4k-3\). Since \(f(4)=17\), we get \(4k-3=17\), so \(4k=20\) and hence \(k=5\). Option C is the intermediate value of \(4k\), not the value of \(k\); dividing by 4 is still required. Exam tip: after substitution, isolate the unknown completely before selecting the final answer.

Related tags

Linear FunctionParameterSubstitutionAlgebraic EquationsReflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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