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If (Y(x)=a+7x) is linear growth and (Y(2)+Y(8)=150), what is (a)?

Answer and explanation

Correct answer: 40

Given \(Y(x)=a+7x\), we get \(Y(2)=a+14\) and \(Y(8)=a+56\). Hence, \(Y(2)+Y(8)=2a+70=150\). Therefore, \(2a=80\) and \(a=40\). If 45 were used, the sum would be \(160\), so it is not correct. Exam tip: Substitute each given \(x\)-value into the function separately before adding.

Related tags

Linear FunctionPolynomial EvaluationAlgebraic EquationsLinear GrowthParameter ValueLinear Growth And DecayIntroduction To PolynomialsMathematics

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