1462. Найдите решение систем уравнений способом сложения:
1) 7х + 2y = 9,
5x + 2y = 10;
3) x + 7y = 19,
x + 5y = 13;
2) [9x – 2y = -17,
|x - 2y = 7;
4) 5x - 2y = 15,
2х – у = 7
1) 7х + 2y = 9,
5x + 2y = 10;
3) x + 7y = 19,
x + 5y = 13;
2) [9x – 2y = -17,
|x - 2y = 7;
4) 5x - 2y = 15,
2х – у = 7
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