**Source Code:**

#include<stdio.h>#include<math.h>int main(){float xy[20][20], matrix[3][4], ratio, a;float sum_x = 0, sum_y = 0, sum_x2 = 0, sum_x3 = 0, sum_x4 = 0, sum_xy = 0, sum_x2y = 0;int i, j , k, n;printf("Enter no of data: ");scanf("%d", &n);printf("Enter the data: \n");for(i = 0; i < 2; i++){for(j = 0; j < n; j++){scanf("%f", &xy[i][j]);}}for(i = 0; i < n; i++){sum_x += xy[0][i];sum_y += xy[1][i];sum_x2 += pow(xy[0][i], 2);sum_x3 += pow(xy[0][i], 3);sum_x4 += pow(xy[0][i], 4);sum_xy += xy[0][i]*xy[1][i];sum_x2y += pow(xy[0][i], 2) * xy[1][i];}matrix[0][0] = n;matrix[0][1] = sum_x;matrix[0][2] = sum_x2;matrix[0][3] = sum_y;matrix[1][0] = sum_x;matrix[1][1] = sum_x2;matrix[1][2] = sum_x3;matrix[1][3] = sum_xy;matrix[2][0] = sum_x2;matrix[2][1] = sum_x3;matrix[2][2] = sum_x4;matrix[2][3] = sum_x2y;for(i = 0; i < 3; i++){for(j = 0; j < 3; j++){if(i!=j){ratio = matrix[j][i]/matrix[i][i];for(k = 0; k < 4; k++){matrix[j][k] -= ratio * matrix[i][k];}}}}for(i = 0; i < 3; i++){a = matrix[i][i];for(j = 0; j < 4; j++){matrix[i][j] /= a;}}for(i = 0; i < 3; i++){printf("\n%c => %.2f", 97+i, matrix[i][3]);}}

doesn't work

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