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For which (k) will (y=410-(k-8)x) show linear decay?

Answer and explanation

Correct answer: \(k>8\)

The expression can be written as \(y=410-(k-8)x=410+(8-k)x\). For linear decay, the coefficient of \(x\) (the slope) must be negative. Thus, \(8-k<0\), which gives \(k>8\). When \(k=8\), the slope is zero and the value remains constant; when \(k<8\), the slope is positive, giving linear growth. Exam tip: check the sign of the coefficient of \(x\) to identify linear growth or decay.

Related tags

Linear DecayLinear GrowthSlopeParameter ConditionPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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