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multiplicmos por 2 la 2°Ec: 12X - 4Y = 32 (Ec 3)
Restemos Ec 3 - 1° Ec: 12x -4y -10x +4y = 32 - 8
Resolvamos: 2x = 24 , entonces x =12
Busquemos y remplazando x en la 2°EC
Entonces: 6(12) -2y = 18
72 -18 = 2y
54 = 2y , entonces y = 27
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