Exercitiul 2(b)
[tex] \left \{ {{x+y=-4} \atop {xy=3}} \right. [/tex]
[tex] \left \{ {{y+4=x} \atop {(y+4)y=3}} \right. [/tex]
[tex] \left \{ {{x=y+4} \atop {2y+4y=3}} \right. [/tex]
[tex] \left \{ {{x=y+4} \atop {6y=3}} \right. [/tex]
[tex] \left \{ {{x=y+4} \atop {y= \frac{3}{6}=0,5 }} \right. [/tex]
[tex] \left \{ {{x=0,5+4} \atop {y=0,5}} \right. [/tex]
[tex] \left \{ {{x=3,5} \atop {y=0,5}} \right. [/tex]
