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y: Precio televisores
6x+5y=8700
Si x'=x/6 "Se rebaja a la sexta parte del precio original"
5(x/6)+10y=8000
y=?
Solución:
6x+5y=8700
5(x/6)+10y=8000
6x+5y=8700
(5x+60y)=48000
6x+5y=8700 (-12)
(5x+60y)=48000
-72x-60y=-104400
5x+60y=48000
_______________
-67x=-56400
x=841,7910 $
de 5x+60y=48000
y=(48000-5x)/60
y=729.85075 $