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For which (k) will (y=320-(k-6)x) show linear decay?

Answer and explanation

Correct answer: \(k>6\)

The coefficient of \(x\), or slope, in \(y=320-(k-6)x\) is \(-(k-6)=6-k\). For linear decay, \(y\) must decrease as \(x\) increases, so the slope must be negative: \(6-k<0\). Hence, \(k>6\). When \(k=6\), the slope is zero and the value remains constant, not decaying. Exam tip: in \(y=a+mx\), decay occurs when \(m<0\).

Related tags

Linear DecayLinear EquationsSlopeParameter ConditionPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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