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If (Y(x)=a+8x) is linear growth and (Y(3)+Y(9)=180), what is (a)?

Answer and explanation

Correct answer: 42

Given \(Y(x)=a+8x\), we get \(Y(3)=a+24\) and \(Y(9)=a+72\). Therefore, \(Y(3)+Y(9)=(a+24)+(a+72)=2a+96\). Equating this to 180 gives \(2a+96=180\), so \(2a=84\) and \(a=42\). If 48 were used, the sum would be \(2(48)+96=192\), not 180. Exam tip: Substitute each given \(x\)-value into the function separately before forming the required sum.

Related tags

Linear FunctionPolynomial EvaluationParameter ValueAlgebraic EquationsClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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