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Which of the following linear polynomials represents a situation in which the value of the polynomial decreases by 7 units for every increase of 1 unit in x?

Answer and explanation

Correct answer: \(P(x)=45-7x\)

In a linear polynomial \(ax+b\), the coefficient \(a\) gives the change when x increases by 1. The required change is \(-7\), so \(45-7x\) is correct. In \(45+7x\), the value rises by 7. Exam tip: decay has a negative coefficient of x.

Related tags

Linear PolynomialsLinear DecayCoefficientAlgebraClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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