Ответ:
1) у=7-3х
-5х+2(7-3х)=3
у=7-3х
-5х+14-6х=3
-11х=3-14
х=1
у=7-3
у=4
2) у=12-2х
7х-2у=31
у=12-2х
7х-24+4х=31
11х=55
у=2
х=5
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Ответ:
1) у=7-3х
-5х+2(7-3х)=3
у=7-3х
-5х+14-6х=3
у=7-3х
-11х=3-14
у=7-3х
х=1
у=7-3
х=1
у=4
х=1
2) у=12-2х
7х-2у=31
у=12-2х
7х-24+4х=31
у=12-2х
11х=55
у=2
х=5