Răspunsuri

2014-08-16T12:07:36+03:00
X+y=23

x=23-y

3x+7y=113

3(23-y)+7y=113

69-3y+7y=113

69+4y=113

4y=113-69

4y=44

y=11

x=23-11

x=12
2 5 2