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Which of the following equations represents a quantity decreasing at a constant rate?

Answer and explanation

Correct answer: \(y=12-5x\)

In \(y=12-5x\), the coefficient \(-5\) means that \(y\) decreases by 5 units whenever \(x\) increases by 1. \(y=5x+12\) shows constant growth instead. Exam tip: a negative coefficient of \(x\) identifies linear decay.

Related tags

PolynomialsLinear EquationsLinear DecayConstant RateAlgebraClass 9Linear Growth And DecayIntroduction To Polynomials

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