The solution of the differential equation\[\frac{dy}{dx}=\frac{1-3y-3x

1.	The solution of the differential equation\[\frac{dy}{dx}=\frac{1-3y-3x}{1+x+y}\] is
A.	\[x+y-\ell n\left\| x+y \right\|=c\]
B.	\[3x+y+2\ell n\left\| 1-x-y \right\|=c\]
C.	\[x+3y-2\ell n\left\| 1-x-y \right\|=c\]
D.	None of these
Answer» C. \[x+3y-2\ell n\left\| 1-x-y \right\|=c\]

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The solution of the differential equation\[\frac{dy}{dx}=\frac{1-3y-3x}{1+x+y}\] is

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