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If a quantity is modelled by \(P(t)=a-bt\), where \(b>0\), which property correctly identifies linear decay?

Answer and explanation

Correct answer: \(P\) decreases by equal amounts in equal time intervals

The slope of \(P(t)=a-bt\) is the constant negative value \(-b\), so equal time intervals produce equal decreases. A changing slope indicates non-linear decay. Exam tip: identify \(-b\) as the constant decay rate.

Related tags

PolynomialsLinear DecayLinear FunctionsSlopeClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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