# Find the particular solution satisfying the given condition $x^2dy+(xy+y^2)\;dx=0;y=\;1;\;when\;x=\;1$
$\begin{array}{1 1} (A)\;y + 2x = 3x^2 \\(B)y - 2x = 3x^2 \\ (C)\;y + x = 3x^2 \\(D)\;y + 4x = 3x^2 \end{array}$