\begin{lgathered}\left \{ {{2x-2x+3y+4y=10+18} \atop {2x+3y=10}} \right. \\ \left \{ {{7y=28} \atop {2x=10-3y}} \right. \\ \left \{ {{y=4} \atop {2x=10-3*4}} \right. \\ \left \{ {{y=4} \atop {2x=-2}} \right. \\ \left \{ {{y=4} \atop {x=-1}} \right.\end{lgathered}{2x+3y=102x−2x+3y+4y=10+18{2x=10−3y7y=28{2x=10−3∗4y=4{2x=−2y=4{x=−1y=4
ответ(-1;4)