The differential equation \[y\frac{dy}{dx}+x=a\](a is any constant) re

1.	The differential equation \[y\frac{dy}{dx}+x=a\](a is any constant) represents
A.	A set of circles having centre on the y-axis
B.	A set of circles centre on the x-axis
C.	A set of ellipses
D.	None of these
Answer» C. A set of ellipses

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The differential equation \[y\frac{dy}{dx}+x=a\](a is any constant) represents

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