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Metodo de reduccion.
6x - 4y = 12 (1)
3x + y = 9 (2) Multiplico (2) por - 4
(3x + y = 9)( 4)
12x + 4y = 36 Le sumamos (1)
6x - 4y = 12
-------------------
18x + 0 = 48
18x = 48
x = 48/18 Simplificas sacas 6ta
x = 8/3 Reemplazas este valor en (2)
3x + y = 9
3(8/3) + y = 9
8 + y = 9
y = 9 - 8
y = 1
Solucion.
(8/3 , 1)