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If (Z(x)=b-7x) is linear decay and (Z(2)+Z(6)=128), what is (b)?

Answer and explanation

Correct answer: 92

Given \(Z(x)=b-7x\), we get \(Z(2)=b-14\) and \(Z(6)=b-42\). Hence, \((b-14)+(b-42)=128\), so \(2b-56=128\). Therefore, \(2b=184\) and \(b=92\). If 96 were used, the sum would be 136, so it is not correct. Exam tip: Substitute each given \(x\)-value into the function separately before adding the results.

Related tags

Linear FunctionsLinear DecayPolynomial EvaluationAlgebraic EquationsParameter DeterminationLinear Growth And DecayIntroduction To PolynomialsMathematics

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