{5x-3y=-9
{x-4y=5 =>{х=5+4у
5(5+4у)-3у=-9
25+20у-3у=-9
17у=-34
у=-2
х=5+4×(-2)=-3
Ответ: х=-3; у=-2
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{5x-3y=-9
{x-4y=5 =>{х=5+4у
5(5+4у)-3у=-9
25+20у-3у=-9
17у=-34
у=-2
х=5+4×(-2)=-3
Ответ: х=-3; у=-2