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Which of the following equations represents linear decay, where \(y\) decreases by the same amount for every one-unit increase in \(x\)?

Answer and explanation

Correct answer: \(y=50-3x\)

In \(y=50-3x\), the coefficient of \(x\) is \(-3\), so \(y\) falls by 3 for each one-unit rise in \(x\). Relations involving \(x^2\) or \(1/x\) are not linear. Exam tip: identify decay by a constant negative slope.

Related tags

PolynomialsLinear EquationsLinear DecaySlopeClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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