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8x - 2y = 12
4x +2y = 12
--------------------
12x + 0y = 24
12x = 24
x = 24/12
x = 2
El valor de x lo reemplazamos en la segunda ecuación
4x + 2y = 12
4 (2) + 2y = 12
8 + 2y = 12
2y = 12 - 8
2y = 4
y = 4/2
y = 2
Respuesta
x = 2
y = 2
4x +2y = 12 ----------------- 2 sumando 1y 2
8x - 2y = 12
4x +2y = 12
---------------
12x = 24
x = 24/12
x = 2
8(2) -2y = 12
16-2y = 12
16-12 = 2y
2y = 4
y = 4/2
y = 2