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In a delivery service, the distance is \(x\) km and the total charge is \(y\) rupees. The charge is 260 rupees for 3 km and 420 rupees for 7 km. Which linear model correctly represents this situation?

Answer and explanation

Correct answer: \(y=40x+140\)

The slope is \((420-260)/(7-3)=40\) rupees per km. Substituting \(x=3, y=260\) in \(y=40x+b\) gives \(b=140\). Option B wrongly treats the charge at 3 km as the y-intercept. Exam tip: put \(x=0\) to check the fixed charge.

Related tags

Linear EquationsSlopeY-InterceptCoordinate GeometryWord ProblemsMathematics Class 9Slope And Y InterceptIntroduction To Polynomials

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