Question

Stim ca x supra y=5 supra 13 si x+y=80
Aflati x si y! Dau 10 puncte

Answer 1

$\frac{x}{y} = \frac{5}{13} ;x+y=80 \\ 13x-5y=0;x=80-y \\ 13(80-y)-5y=0 \\ -18y=-1040 \\ y= \frac{1040}{18}= \frac{520}{9} \\ x=80- \frac{520}{9}= \frac{200}{9}$