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If (f(x)=a+11x) and (f(2)=61), what will (f(9)) be?

Answer and explanation

Correct answer: 138

Given \(f(2)=a+11\times2=61\), we get \(a+22=61\), so \(a=39\). Therefore, \(f(9)=39+11\times9=39+99=138\). Option 127 may result from incorrectly calculating or adding the increase \(11\times(9-2)=77\). Exam tip: In a linear function, multiply the change in \(x\) by its coefficient to find the change in the function value quickly.

Related tags

Linear FunctionsPolynomialsFunction EvaluationLinear GrowthAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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