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For which (k) will (y=140-(k-5)x) show linear decay?

Answer and explanation

Correct answer: \(k>5\)

In the linear form \(y=a+mx\), the value of \(y\) decreases as \(x\) increases when the slope \(m\) is negative; this represents linear decay. Here, the slope is \(-(k-5)=5-k\). For decay, \(5-k<0\), which gives \(k>5\). If \(k<5\), the slope is positive and the relation shows growth, while for \(k=5\), the slope is zero and the value remains constant. Exam tip: To identify growth or decay, check the sign of the coefficient of \(x\).

Related tags

Linear DecaySlopeParameter ConditionLinear EquationPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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