Система уравнения:

2n*n - 3nm = - 4

3n+m=5

                                                                                                                                   {[n=1

{2n^2 - 3nm = - 4,  {2n^2-3n(5-3n)=-4,  {2n^2-15n+9n^2=-4,   {11n^2-15n+4=0,  {[m=2

{3n+m=5                 {m=5-3n                   {m=5-3n                       {m=5-3n                {[n=4/11

                                                                                                                                   {[m=3 10/11

11n^2-15n+4=0      

D=225-176=49        

n1=15+7

        22

n1=1

n2=15-7

        22

n2=4/11