Verified answer

[tex]\displaystyle \left \{ {{6x-y=3} \atop {3x+y=6}} \right. \\\\\left \{ {{6x-y=3} \atop {y=6-3x}} \right.\\ \\6x-(6-3x)=3\\x=1\\y=6-3*1\\y=3\\(x,y)=(1,3)[/tex]

Ответ:

6х-у=3

у=6-3х

6х-(6-3х)=3

х=1

у=6-3×1

у=3

(х,у)=(1,3)