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Which of the following expressions shows that a quantity decreases linearly by 5 units for every increase of 1 in n?

Answer and explanation

Correct answer: \(P(n)=72-5n\)

In \(P(n)=72-5n\), the coefficient of n is −5, so increasing n by 1 changes P by −5. \(72-5n^2\) is not linear because it contains n². Exam tip: a linear expression has the variable to power 1.

Related tags

PolynomialsLinear DecayLinear GrowthCoefficientAlgebraClass 9Linear Growth And DecayIntroduction To Polynomials

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