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Which of the following relations represents linear decay of y as x increases?

Answer and explanation

Correct answer: \(y=80-5x\)

In \(y=80-5x\), every increase of 1 in x decreases y by a constant 5, so it shows linear decay. Option B has a positive slope and represents growth. Exam tip: linear decay always has a negative coefficient of x.

Related tags

PolynomialsLinear GrowthLinear DecaySlopeLinear EquationsClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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