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A taxi fare is modelled by \(T=12.5d+80\), where \(d\) is the distance travelled in kilometres and \(T\) is the total fare in rupees. A student interprets the slope and y-intercept. Which interpretation is correct?

Answer and explanation

Correct answer: The initial charge is ₹80, and the fare increases by ₹12.5 for each additional kilometre.

At \(d=0\), \(T=80\), so ₹80 is the y-intercept or fixed initial fee. Increasing \(d\) by 1 km adds ₹12.5, so it is the slope. Treating ₹12.5 as the intercept confuses the coefficient with the constant. Exam tip: set the input to zero to find the intercept.

Related tags

SlopeY-InterceptLinear EquationsReal-Life ApplicationGraph InterpretationSlope And Y InterceptIntroduction To PolynomialsMathematics

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