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x+y = 6 ....(2)
despejamos x en la ecuación ...(2)
x+y= 6
x = 6-y
reemplazamos x=6-y en la ecuación ...(1)
3x-y = 15
3(6-y)-y = 15
18-3y-y = 15
18-4y = 15
3 = 4y
3/4 = y
reemplazamos y=3/4 en la ecuación ...(2)
x+y = 6
x+3/4 = 6
(4x+3)/4 = 6
4x +3 = 24
4x = 21
x= 21/4
Rpta: los numero son 21/4 y 3/4. :)