Question 764473
x+y+z=9
2x+5y+7z=52
2x+y-z=0
delta=       1   1   1
             2   5   7
             2   1   -1
                         =-4
delta x= 
              9    1    1
             52   5    7
             0    1   -1 
                        =-4/-4=1
delta y=      
             1   9    1   
             5   52    7
             1    0   -1 
                         =-12/-4=3
delta z=
                 1   1   9       
                 7   5   52      
                -1   1   0        
                          =-20/-4=5
ANSWER=x=1,y=3,z=5
                       

                               _____________M.Srikanth
                                              XI std