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For which (k) will (y=55+(k-7)x) show linear growth?

Answer and explanation

Correct answer: \(k>7\)

In a linear equation, the coefficient of \(x\) represents the rate of increase or decrease. Here the slope is \(k-7\). For linear growth, it must be positive: \(k-7>0\), so \(k>7\). If \(k=7\), the slope is zero and \(y=55\) is constant, not growth. Exam tip: check whether the slope is positive for growth and negative for decay.

Related tags

Linear GrowthSlopeParameter ConditionLinear EquationRate Of ChangeLinear Growth And DecayIntroduction To PolynomialsMathematics

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