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For which (k) will (y=25+(k-4)x) show linear growth?

Answer and explanation

Correct answer: \(k>4\)

In the linear equation \(y=25+(k-4)x\), the coefficient of \(x\), or slope, is \(k-4\). For linear growth, the slope must be positive. Thus, \(k-4>0\), which gives \(k>4\). When \(k=4\), the slope is zero and \(y=25\) is a constant line, not growth. Exam tip: check whether the coefficient of \(x\) is positive for growth and negative for decay.

Related tags

Linear GrowthLinear EquationsSlopeParameter ConditionRate Of ChangeLinear Growth And DecayIntroduction To PolynomialsMathematics

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