imo class 12 differential equations

The differential equation dy/dx = y/x + (φ(y/x)) / (φ'(y/x)) is reducible to variable separable form by substituting:

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The differential equation dy/dx = y/x + (φ(y/x)) / (φ'(y/x)) is reducible to variable separable form by substituting:

  • A. y = vx
  • B. x = vy
  • C. x + y = v
  • D. xy = v

Answer: A) y = vx

Explanation: Since the terms are functions of y/x, substituting y = vx (or v = y/x) transforms the equation into a variable separable form.

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