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2X + 3Y = 11 (Ecuacion 1)
X + 2Y = 7 (Ecuacion 2)
En (2)
X = 7 - 2Y
Reemplazo X en (1)
2X + 3Y = 11
2(7 - 2Y) + 3Y = 11
14 - 4Y + 3Y = 11
14 - Y = 11
14 - 11 = Y
3 = Y
Reemplazo Y en
X = 7 - 2Y
X = 7 - 2(3)
X = 7 - 6
X = 1
Rta: X = 1; Y = 3