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AP EAMCET · Maths · Differential Equations

Suppose that \(f(x, y)\) and \(g(x, y)\) are homogeneous functions of same order. If \(x=V y\) reduces the equation \(\frac{d y}{d x}=\frac{f(x, y)}{g(x, y)}\) to the form \(\frac{d V}{d y}=\frac{1}{y}(F(V))\), then \(F(V)=\)

  1. A \(\left(\frac{f(1, V)}{g(1, V)}-V\right)\)
  2. B \(\left(\frac{f(V, 1)}{g(V, 1)}-V\right)\)
  3. C \(\left(\frac{g(1, V)}{f(1, V)}-V\right)\)
  4. D \(\left(\frac{g(V, 1)}{f(V, 1)}-V\right)\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\left(\frac{g(V, 1)}{f(V, 1)}-V\right)\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}=\frac{f(x, y)}{g(x, y)}\)...(i) \(x=V y\) \(\begin{array}{ll}\Rightarrow & \frac{d x}{d y}=V+y \frac{d v}{d y} \\ \Rightarrow & y \frac{d V}{d y}=\frac{d x}{d y}-V \\ \Rightarrow & \frac{d V}{d y}=\frac{1}{y}\left(\frac{d x}{d y}-V\right)\end{array}\) From Eq.…