The solution of the differential equation  represents a family of:

  1. Straight lines
  2. Circles
  3. Parabolas
  4. Ellipses

Answer (Detailed Solution Below)

Option 1 : Straight lines
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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Concept:

First Order Linear Differential Equation:
A differential equation of the from  + P × y = Q, where P and Q are constants or functions of x only, is known as a first order linear differential equation.

Steps to solve a First Order Linear Differential Equation:

  • Convert into the standard form  + P × y = Q, where P and Q are constants or functions of x only.
  • Find the Integrating Factor (F) by using the formula: F = .
  • Write the solution using the formula:  where C is the constant of integration.

 

Calculation:

⇒ P =  and Q = .

Integrating factor F = .

The solution of the given differential equation is:

⇒ y = Cx - 3, which is the equation of a straight line.

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