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3X + 2Y = 13 (2)
En (1): X = 6 + Y
En (2): 3X = 13 - 2Y
X = 13/3 - (2/3)Y
X = X:
6 + Y = 13/3 - (2/3)Y
6 - 13/3 = -(2/3)Y - Y
18/3 - 13/3 = -2Y/3 - 3Y/3
5/3 = -5Y/3
Y = (5/3)/(-5/3)
Y = -1
Ahora Reemplazo el valor de Y en (1)
X = 6 + Y
X = 6 + (-1)
X = 5
Rta: X = 5 , Y = -1