3x + 5y = 12
x - y= - 4;
x =у-4
3(у-4)+5у=12
3у-12+5у=12
8у=24
у=3
х=3-4=-1
ответ:(-1;3)
х+5у=14
х-2у=-7
х=14-5у
14-5у-2у=-7
-7у=-7-14
-7у=-21
х=14-5*3=-1
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3x + 5y = 12
x - y= - 4;
3x + 5y = 12
x =у-4
3(у-4)+5у=12
3у-12+5у=12
8у=24
у=3
х=3-4=-1
ответ:(-1;3)
х+5у=14
х-2у=-7
х=14-5у
14-5у-2у=-7
-7у=-7-14
-7у=-21
у=3
х=14-5*3=-1
ответ:(-1;3)