Least Square Linear Model Program

#include<stdio.h>

#include<stdlib.h>

int main(){

   int n,i;

   float a,b,x[10],y[10],sx,sy,sx2,sxy;

   printf("Saroj Rana\nRoll:37\tSem:3rd\n");

   printf("Enter number of points:");

   scanf("%d",&n);

   for(i=0;i<n;i++){

       printf("Enter value for x and y at i=%d\n",i);

       scanf("%f%f",&x[i],&y[i]);

   }

   sx=0;

   sy=0;

   sx2=0;

   sxy=0;

   for(i=0;i<n;i++){

       sx+=x[i];

       sy+=y[i];

       sxy+=(x[i]*y[i]);

       sx2+=(x[i]*x[i]);

   }

   b=((n*sxy)-(sx*sy))/((n*sx2)-(sx*sx));

   a=(sy/n)-(b*sx/n);

   printf("Equation of form:  y=ax+b");

   printf("\nStraight line equation:  y=%0.3fx+%0.3f",b,a);

   return 0;

}