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Tenemos.
x 3
--- = ---- Pero x + y = 25 ,Entonces x = 25 - y reemplazas
y 2
25 - y 3
--------- = ----
y 2
2(25 - y) = 3y
50 - 2y = 3y
50 = 3y + 2y
50 = 5y
50/5 = y
10 = y
x 3
-- = -----
y 2
x 3
--- = -----
10 2
2x = 10*3
2x = 30
x = 30/2
x = 15
Respuesta.
y = 10
x = 15
y--->2
y=(x-1)
x=(y+1)
(y+1)+y=25
2y=24
y=12
x=13