Răspunsuri

2014-11-19T10:21:38+02:00
7a + 3b= 293a+3b+4a=29
3*7+4a=29
4a=29-21
4a=8
a=8:4
a=2

b=7-a=7-2=5
b=5

2014-11-19T10:23:28+02:00
3a+4a+3b=3(a+b)+4a=29
3x7+4a=29,4a=29-21=8,a=2
b=5