СРОЧНО ПО БИЛИМЛЕНДУ!!!! Укажи, решением какой системы уравнений является пара чисел (2; 1).
3х + y = 10,
6x — у = 3.
5х + y = 11,
6x — 5y = 7.
- 2х + 3y = –12,
4х – Зу = 5.
х+у= -4,
І — у = 8.​
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