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Which of the following equations represents a linear model with an initial value of 18, in which y decreases by 2.5 units for every 1-unit increase in x?

Answer and explanation

Correct answer: \(y=18-2.5x\)

In \(y=18-2.5x\), the constant term 18 is the initial value and the coefficient \(-2.5\) shows an equal decrease per unit of x. Option C is not linear because it contains \(x^2\). Exam tip: for linear decay, x has power 1 and a negative coefficient.

Related tags

PolynomialsLinear ModelLinear DecayCoefficientAlgebraic ExpressionsClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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