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Which of the following linear polynomial models shows that \(y\) decreases at a constant rate as \(x\) increases and that \(y\) is positive when \(x=0\)?

Answer and explanation

Correct answer: \(y=-3x+12\)

In \(y=-3x+12\), the coefficient of \(x\) is \(-3\), so \(y\) falls by 3 units for every increase of 1 in \(x\). Substituting \(x=0\) gives 12, which is positive. Option C has a negative initial value. Exam tip: decay requires a negative slope.

Related tags

Linear PolynomialsLinear DecaySlopeY-InterceptClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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