Răspunsuri

2014-09-11T15:22:48+03:00
X+y=4
x=4-y

3x+y=6
3(4-y)+y=6

12-3y+y=6

-2y=6-12

-2y=-6

2y=6

y=3

x=4-3
x=1
1 3 1