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A water tank initially contains 120 litres of water, and water is added at a constant rate of 8 litres per minute. A student writes \(W=120t+8\) for water quantity \(W\) and time \(t\). What is the error in the model?

Answer and explanation

Correct answer: The per-minute rate and the initial amount have been interchanged; the correct model is \(W=8t+120\).

In a linear model, the value of \(W\) at \(t=0\) is the initial amount, so it must be 120. The rate 8 litres per minute is the slope; hence \(W=8t+120\). Exam tip: substitute \(t=0\) to check the intercept.

Related tags

Linear EquationsSlopeY-InterceptMathematical ModellingError AnalysisSlope And Y InterceptIntroduction To PolynomialsMathematics

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