CBSEGrade 11MathematicsRelations and Functions

Can you find a function that best models this relationship?

The number of buses deployed during peak hours in a city is directly proportional to the square of the number of students in the city, and inversely proportional to the number of trains running on that day. If 10 buses were deployed when there were 400 students and 8 trains. Find a function that describes this relationship and explain your reasoning.

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📌 CONCEPT: A function that models this relationship can be described as a linear function with variables representing the square of the number of students and the inverse of the number of trains.

📐 RULE / FORMULA: The function is given by f(x) = k × (n^2) / p, where 'n' is the number of students, 'p' is the number of trains, and 'k' is the constant of proportionality.

💡 WORKED EXAMPLE: If 10 buses were deployed when there were 400 students and 8 trains, we have f(400, 8) = 10. Substituting the values in the function, we get 10 = k × (400^2) / 8. Solving for 'k', we find k = 10 × 8 / (400^2) = 1.6 × 10^(-4). Therefore, the function is f(n, p) = 1.6 × 10^(-4) × (n^2) / p.

⚠️ COMMON MISTAKE: Students might confuse the direct and inverse proportionality, leading to incorrect formulation of the function.

18 Oct 26