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x + y = 6
x - y = 4 ...........entonces: x = 6 - y , x = 4 + y ⇒ 6 - y = 4+ y ⇒ y = 1
2x + y = 12
x - 2y = 1 ....entonces: x = (12 - y)/2 , x = 1 + 2y ⇒ (12 - y)/2 = 1 + 2y ⇒ y = 2
Jajajaja...disculpa me tengo que ir XD