Răspunsuri

2014-04-11T09:38:13+03:00
x+3y=7
4x-y=2
x=7-3y
4(7-3y)-y=2
28-12y-y=2
28-2=12y+y
26=13y
⇒y=13
x=7-3y
x=7-39
⇒x=-32
sper ca te-am ajutat