Please Guys, this code is from a math program, i want to understand it:

at line 5 what is done to rt?

at line 8 what does continue do?

at line 9 and 11 what is done to rt?

and thanks to you all

note that sys and back are defined previously as double **sys, *back;Code:`1 double evaluate(int g)`

2 {

3 int u;

4 double rt=0;

5 rt=sys[g][nun];

6 for(u=0;u<nun;u++)

7 {

8 if(g==u) continue;

9 rt-=sys[g]*back;

10 }

11 rt/=sys[g][g];

12 return rt;

13 }