/* Here is an (x,y) program.*/
#include <iostream>
#include <stdlib.h>
#include <math.h>

using namespace std;

int main(void)

{
	double y1 = fabs(0);
	double x1 = fabs(0);
	double result1 = fabs(0);
	double y2 = fabs(0);
	double x2 = fabs(0);
	double result2 = 0;
	double result = 0;
	
	cout << "Please enter your Y-axis to your first point";
	cin >> y1;
	
	cout << "Please enter your X-axis to your first point";
	cin >> x1;
	
	cout << "Please enter you Y-axis to your second point";
	cin >> y2;
	
	cout << "Please enter your X-axis to your second point";
	cin >> x2;
	
	result1 = y1 - y2;
	
	result2 = x1 - x2;
	
	result = result1 / result2;
	
	cout << result <<endl;
	
	return 0;
	
}