#include <stdio.h>

main()

{

int i, n;

float x, y, m, b, sx, sy, sx2, sxy;

printf("Input number of points: ");

scanf("%d", &n);

sx = sy = sx2 = sxy = 0.0;

for (i=0; i < n; i++) {

printf("Input x y: ");

scanf("%f %f", &x, &y);

sx += x;

sy += y;

sx2 += x*x;

sxy += x*y;

}

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

b = (sy - m * sx) / n;

printf("The equation of the line of best fit is: %fx + %f\n", m, b);

return 0;

}