{ 2x+у=1
{ 3х-5у=21
у=1-2х
3х-5(1-2х)=21
3х-5+10х=21
13х=21+5
13х=26
х=26/13=2
х=2
у=1-2*2=1-4=-3
у=-3
Ответ: (2; -3)
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{ 2x+у=1
{ 3х-5у=21
у=1-2х
3х-5(1-2х)=21
3х-5+10х=21
13х=21+5
13х=26
х=26/13=2
х=2
у=1-2*2=1-4=-3
у=-3
Ответ: (2; -3)