#include <stdio.h>
 
int main() {
    // Given data
    int x[] = {-2, -1, 0, 1, 2};
    int y[] = {1, 2, 3, 4, 5};
    int n = 5;  // Number of data points
 
    // Variables to calculate sums
    int sum_x = 0, sum_y = 0, sum_xy = 0, sum_x2 = 0;
 
    // Calculate sums
    for (int i = 0; i < n; i++) {
        sum_x += x[i];
        sum_y += y[i];
        sum_xy += x[i] * y[i];
        sum_x2 += x[i] * x[i];
    }
 
    // Calculate slope (b) and intercept (a)
    float b = (n * sum_xy - sum_x * sum_y) / (n * sum_x2 - sum_x * sum_x);
    float a = (sum_y - b * sum_x) / n;
 
    // Output the results
    printf("Least square line: y = %.2f + %.2fx\n", a, b);
 
    return 0;
}
 
 

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