cum vaca are 4 picioare notam vaca cu 4y
cum gaina are 2 picioare notam gaina cu 2x
[tex] \left \{ {{2x+4y=60} \atop {x+y=24}} \right. [/tex]
se inmulteste in ecuatia de jos cu -2
[tex] \left \{ {{2x+4y=60} \atop {-2x-2y=-48}} \right. [/tex]
2y=12
y=6(vaci)
24-6=18(gaini)
