1. Сколько решений имеет система: (х-3у=6,
(2х-6у=12;

2. Решите систему:
а)подстановкой
б)сложением
(х-у=5,
(2х+3у=-25;

3. Решите систему:
(3х-2у=12,
(4х+3у=1;
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