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77 + 35y + 4y = -1
78 = -39y
y = -2
x - 5(-2) = 11
x = 11 - 10
x = 1
7x + 4y = -1 x(1) 1
x - 5y = 11 x(-7) 2
7x + 4y = -1
-7x + 35y = -77
39y = -78
y = -78/39
y= -2
Ahora aplicamos sustitucion
Y = -2 en 2
x - 5y = 11
x - 5x(-2) = 11
x +10= 11
x = 11-10
x= 1