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If (y=15+kt) is linear growth, what must be true about (k)?

Answer and explanation

Correct answer: \(k>0\)

In \(y=15+kt\), \(k\) is the constant rate of change (slope) of \(y\) with respect to \(t\). For linear growth, \(y\) must increase as \(t\) increases, so \(k>0\) is necessary. If \(k<0\), the relation shows linear decay, while \(k=0\) makes \(y\) constant. Exam tip: in \(y=a+bt\), the sign of \(b\) tells whether there is growth or decay.

Related tags

Linear GrowthLinear DecaySlopeRate Of ChangePolynomial IntroductionLinear Growth And DecayIntroduction To PolynomialsMathematics

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