Ответ:{а+2b=5
3a-b=8
a=5-2b
3(5-2b) - b=8
3 (5-2b) - b=8
15-6b-b=8
15-7b=8
7b=15-8
7b=7
b=7:7
b=1
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Ответ:{а+2b=5
3a-b=8
a=5-2b
3(5-2b) - b=8
3 (5-2b) - b=8
15-6b-b=8
15-7b=8
7b=15-8
7b=7
b=7:7
b=1