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For which (k) will (y=200-(k+2)x) show linear decay?

Answer and explanation

Correct answer: \(k>-2\)

In a linear equation, the coefficient of \(x\) is the slope. Here the slope is \(-(k+2)\). For linear decay, the slope must be negative, so \(-(k+2)<0\). Multiplying by \(-1\) reverses the inequality, giving \(k+2>0\), or \(k>-2\). At \(k=-2\), the slope is zero, so the value remains constant rather than decaying. Exam tip: check the sign of the coefficient of \(x\) to identify growth or decay.

Related tags

Linear DecaySlopeInequalitiesLinear EquationsPolynomialsParameter ConditionLinear Growth And DecayIntroduction To Polynomials

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