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y-5n= -1
Despejando y de la 2da ecuacion
y=5n-1
Sustituyendo en la primera ecuacion:
2y-3n=-5.7
2(5n-1)-3n=-5.7
10n -2-3n = -5.7
10n -3n = -5.7+2
7n = -3.7
n= -3.7/7
n= -0.5286
y=5n-1 = 5(-0.5286)-1
y = -2.6429 - 1
y = -3.6429