x=6+y\end{cases}\\\\y(6+y)+6+y=-4\\6y+y^2+6+y+4=0\\y^2+7y+10=0\\y_1=-2\ ;y_2=-5\\x_1=4\ ;x_2=1" alt="\begin{cases}xy+x=-4\\x-y=6=>x=6+y\end{cases}\\\\y(6+y)+6+y=-4\\6y+y^2+6+y+4=0\\y^2+7y+10=0\\y_1=-2\ ;y_2=-5\\x_1=4\ ;x_2=1" align="absmiddle" class="latex-formula">.