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Aflati numerele x sy y stiind ca : 3x-y=12 si x supra y = 3 supra 5 
Urgent va rog !!!



Răspuns :

[tex] \frac{x}{y}= \frac{3}{5} ; \frac{x}{3} =\frac{y}{5}=k;x=3k;y=5k \\3x-y=12;3*3k-5k=12;9k-5k=12;4k=12;k=3 \\ x=3k=3*3 \\ x=9 \\ y=5k=5*3 \\ y=15[/tex]