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X+y=6
X-y= 2
---------
2x __8
x = 8/2
x = 4 solución
para "y"
x + y = 6
4 + y = 6
y = 6 - 4
y = 2 solución
para la ecuación (2)
3x+2y=1
5x-2y= 23
--------------
8x __=24
x = 24/8
x = 3 solución
para "y"
5x-2y = 23
3*3 + 2y = 1
2y = 1 -9
y = -8/2
y = -4 solución