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x - 4y = 2
2x - 5y = 7
1)Igualamos la incógnita (x) y reducimos.
-2(x - 4y = 2)
2x - 5y = 7
-2x + 8y = -4
2x - 5y = 7
-------------------
0 3y=3
y=3/3
y=1
2) Remplazamos en una de las ecuaciones.
x - 4y = 2
x-4(1)=2
x=2+4
x=6
Solución:
x=6
y=1
Espero que sirva!Saludos!