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Which of the following relations represents linear decay, in which y decreases by the same fixed amount for every one-unit increase in x?

Answer and explanation

Correct answer: \(y=42-5x\)

In \(y=42-5x\), the coefficient of x is the constant \(-5\), so y falls by an equal amount each time x increases. A relation containing \(x^2\) is not linear. Exam tip: for linear decay, look for x to power 1 with a negative coefficient.

Related tags

Linear DecayLinear GrowthPolynomialsLinear RelationCoefficientClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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