Помогите решить. Даю 15 баллов.

{х+2у=-1,
{|х-у|=2;

1){х+2у=-1,
{х - у= 2;
3у=-3;
у=-1;
х+2(-1)=-1;
х=1;
(1; -1);

2){х+2у=-1,
{-(х-у)=2;

{х+2у=-1,
{-х+у=2;
3у=1;
у=1/3;
х+2(1/3)=-1;
х=-1-2/3;
х=-1 2/3.
(-1 2/3; 1/3).