Плес, 21ая!!!!!!!!!!!!!!

[latex]\displaystyle \left \{ {{2x-y=-8} \atop { \frac{x-1}{2}+ \frac{y}{3} =1 }} \right. \Rightarrow \left \{ {{y=8+2x} \atop { \frac{x-1}{2}+ \frac{8+2x}{3}=1 }} \right. \Rightarrow \left \{ {{y=8+2x} \atop {3(x-1)+2(8+2x)=6}} \right. \\\\\Rightarrow \left \{ {{y=6} \atop {x=-1}} \right. [/latex]