Question

aflati numerele x si y stiind ca 3x -y = 12 si x supra y = 3 supra 5

Answer 1

x/y=3/5
5x=3y
x=3y/5

3*3y/5-y=12  *5
9y-5y=60
4y=60
y=15

x=3*15/5
x=9