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

Answer and explanation

Correct answer: \(y=18-3x\)

In \(y=18-3x\), the coefficient of x is \(-3\). Thus, for every increase of 1 in x, y decreases by a constant 3, which is linear decay. \(18+3x\) shows linear growth instead. Exam tip: look for a negative coefficient of x in a linear relation.

Related tags

PolynomialsLinear EquationLinear DecayCoefficientAlgebraClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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