Question

POMOCY
DAJE NAJ I DUZO PKT

Answer 1

X+y=5
10%x+20%y=13%*5

x+y=5
0,1x+0,2y=0,13*5

---------------------------------------
0,5(2x-y)-5=0
2x-y=10

x-0,5y=5/*(-2)
2x-y=10

-2x+y= -10
2x-y=10

{x=5
{y=0
lub
{x=15
{y=20
lub
{x=9
{y=8