Х=7-3у
-7х+5*(7-3х)=11
-7х+35-15х=11
-21х=-24
Х=1 3/21= 1 1/7
3у=7-х
3у=7- 1 1/7
3у= 5 6/7
У= 1 20/21
Ответ: (1 1/7; 1 20/21
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Х=7-3у
-7х+5*(7-3х)=11
-7х+35-15х=11
-21х=-24
Х=1 3/21= 1 1/7
3у=7-х
3у=7- 1 1/7
3у= 5 6/7
У= 1 20/21
Ответ: (1 1/7; 1 20/21