11.3. Plot on the coordinate plane the set of points satisfying the equation $2 x^{2}+y^{2}+3 x y+3 x+y=2$.

Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.
Answer: The desired set of points is the union of two lines $y=-x-2$ and $y=-2x+1$. Solution. See problem 10.3.