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2x-5y=1 (Ec. 2)
Por reducción. Multiplicamos Ec. 1 por -2 para eliminar x:
-2x-4y=8
2x-5y=1
-9y=9
y=9/-9=-1
Sustituimos y=-1 en Ec. 1 despejando x:
x=-4-2y
x=-4-2(-1)
x=-4+2
x=-2