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Metodo reducción.
3x - y = 7 (1)
- 5x + 2y = - 9 (2)
Multiplicas (1) por (2)
(3x - y = 7)(2)
6x - 2y = 14 La sumas (2)
-5x +2y = - 9 Reduces
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x = 5 Reemplazas este valor en (1)
3x - y = 7
3x - 7 = y
3(5) - 7 = y
15 - 7 = y
8 = y
Solución.
(5, 8)