using System;

public class Program

{

    public static void Main()

    {

            double[] x = new double[2];

            double[] y = new double[2];

​

            for (int i = 0; i < 2; i++)

            {

             try

                {

                    Console.WriteLine("Skriv x_" + (i + 1));

                    x[i] = Convert.ToInt32(Console.ReadLine());

                    Console.WriteLine("skrive_" + (i + 1));

                    y[i] = Convert.ToInt32(Console.ReadLine());

                    {

                        double a = (y[1] - y[0]) / (x[1] - x[0]);

                        double b = y[0] - a * x[0];

​

                        Console.WriteLine("f(x) = " + a + "x + " + b);

                    }

                }

                catch

                {

                    Console.WriteLine("hov, det var ikke et tal");

                }

            }

        }

    }