Răspuns :
X=7-3Y
Si inlocuim in cea de a 2a ecuatie
4(7-3y)-y=2
4*7-4*3y-y=2
28-12y-y=2
28-13y=2
28-2=13y
26=13y
y=26/13
y=2
si inlocuim in prima ecuatie
x=7-3*2
x=7-6
x=1
Si inlocuim in cea de a 2a ecuatie
4(7-3y)-y=2
4*7-4*3y-y=2
28-12y-y=2
28-13y=2
28-2=13y
26=13y
y=26/13
y=2
si inlocuim in prima ecuatie
x=7-3*2
x=7-6
x=1