{х-у=4 {х=4+у
{х²+у²+2ху=4 {(х+у)²=2²
х+у=2
4+у+у=2
2у=2-4
2у= -2
у= -1
х=4-1=3
Ответ: х=3; у= -1.
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{х-у=4 {х=4+у
{х²+у²+2ху=4 {(х+у)²=2²
х+у=2
4+у+у=2
2у=2-4
2у= -2
у= -1
х=4-1=3
Ответ: х=3; у= -1.