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If (Z(x)=b-6x) is linear decay and (Z(1)+Z(4)=90), what is (b)?

Answer and explanation

Correct answer: 60

Given \(Z(x)=b-6x\), we get \(Z(1)=b-6\) and \(Z(4)=b-24\). Hence, \(Z(1)+Z(4)=(b-6)+(b-24)=2b-30\). Using \(2b-30=90\), we obtain \(2b=120\), so \(b=60\). If 63 were used, the sum would be 96, not 90. Exam tip: Substitute each given value of \(x\) separately before adding the function values.

Related tags

Linear PolynomialLinear DecaySubstitutionAlgebraic EquationsParameter ValueLinear Growth And DecayIntroduction To PolynomialsMathematics

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