x-nr porumbei
y-nr purcei
 [tex] \left \{ {{x+y=51|*(-2)} \atop {2x+4y=132}} \right. [/tex]
[tex] \left \{ {{-2x-2y=-102} \atop {2x+4y=132}} \right. [/tex]
[tex]2y=30
 y=15( 15 purcei)[/tex]
[tex] [tex] \left \{ {{x+y=51|*(-4)} \atop {2x+4y=132}} \right. [/tex][/tex]
[tex] \left \{ {{-4x-4y=-204} \atop {2x+4y=132}} \right. [/tex]
-2x=-72
x=36 ( 36 porumbei)
verificare:
36+15=51
2*36+4*15=72+60=132
raspuns: 15 purcei si 36 porumbei
