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If in (y=120+ax), (y) increases by (88) from (x=6) to (x=14), what is (a)?

Answer and explanation

Correct answer: \(11\)

In \(y=120+ax\), \(a\) is the rate of change of \(y\) with respect to \(x\). The change in \(x\) is \(14-6=8\), so the change in \(y\) is \(8a\). Given \(8a=88\), we get \(a=11\). If \(a=10\), the increase would be \(8\times10=80\), not 88. Exam tip: while finding a change in a linear expression, the constant term \(120\) cancels out.

Related tags

Linear GrowthLinear EquationsRate Of ChangePolynomialsMathematics Class 9Linear Growth And DecayIntroduction To PolynomialsMathematics

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