Q19 / 105 · NTA Abhyas (JEE Main) 2020 · Mathematics · Differential Equations

If the solution of the differential equation 1+exydx+exy1-xydy=0 is x+kyexy=C (where, C is an arbitrary constant), then the value of k is equal to

Correct answer: 1

Solution

The given equation is
exydx-xydy+exydy+dx=0
or exyydxy+exydy+dx=0
⇒dexyy+dx=0
On integrating, we get, 

 exyy+x=C
⇒k=1

Hence, the correct answer is 1.

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