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Question: Answered & Verified by Expert
The general solution of $x d y-y d x=y d y$ is
MathematicsDifferential EquationsJEE Main
Options:
  • A $y=A e^{-x / y}$
  • B $y=A e^x$
  • C $\frac{y}{x}=A e^x$
  • D $\frac{x}{y}+\frac{y}{x}=c$
Solution:
1939 Upvotes Verified Answer
The correct answer is: $y=A e^{-x / y}$
$x d y-y d x=y d y$
$\begin{aligned} & \Rightarrow \quad-(y d x-x d y)=y d y \\ & \Rightarrow \quad-\left(\frac{y d x-x d y}{y^2}\right)=\frac{y d y}{y^2}\end{aligned}$
$\Rightarrow \quad-\int d\left(\frac{x}{y}\right)=\int \frac{d y}{y}$
$\Rightarrow \quad-\frac{x}{y}=\ln |y|+C$
$\Rightarrow \quad y=A e^{-x / y}$

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