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x= -85/6 + 4/3 y
sustituyendo
24(-85/6 + 4/3y) - 5y = -5
-340 + 32y - 5y = -5
27y = 335
y=335/27
x=385/162
6x = -85 + 18y
x = (-85 + 18y)/ 6
Reemplazas eso en la segunda ecuación:
24((-85+18y)/6) - 5y = -5
Resuelves:
(-2040 + 432y)/ 6 - 5y = -5
-340 + 72y - 5y = -5
72y - 5y = -5 + 340
67y = 335
y = 335/67
y = 5
Reemplazas el resultado de "y" en la primera ecuación:
6x - 18(5) = -85
6x - 90 = -85
6x = -85 + 90
6x = 5
x = 5/6
Confirma si está bien:
(5/6) - (18*5) = -85
24(5/6) - (5*5) = -5