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1) 2x + y = 4
2) x - y = 2
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3x + 0y = 6
3x = 6
x = 6/3
x = 2
Reemplazo el valor de x en 2.
x - y = 2
2 - y = 2
- y = 2 - 2
- y = 0
y = 0
Solución :
x = 2
y = 0
x-y=2
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x / = 2
x=2
2-y=2
-y=2-2
y=-2+2
y=0