Răspunsuri

2014-03-12T11:57:57+02:00

3x-y=12

x/y=3/5⇒y=5x/3

Avem 3x-5x/3=12⇒(9x-5x)/3=12(fiindca am amplificat)⇒4x=12*3(am inmultit pe diagonala)⇒x=36/4=9

Obtinem 3x-y=12⇒3*9-y=12⇒y=27-12=15

deci x=9

y=15

3 4 3