The solution of $y d x + x d y = 0$ is

x y = c

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x + y = c

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x - y = c

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x = c y

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Solution

The correct option is D $x y = c$
$y d x + x d y = 0$
$\Rightarrow y + x \frac{d y}{d x} = 0$
$\Rightarrow \frac{d}{d x} (x y) = 0$
$\Rightarrow x y = c$

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