48 zadacha

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _48_zadacha
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter x: ");
            double x = double.Parse(Console.ReadLine());

            //a pod tochka
            Console.WriteLine("A pod tochka:");
            if (x <= 0)
            {
                Console.WriteLine("y= " + xIsNegative(x));
            }
            else
            {
                Console.WriteLine("y= " + xIsPositive(x));
            }
        }

        private static double xIsNegative(double x)
        {
            return 5 * x + 1;
        }

        private static double xIsPositive(double x)
        {
            return 1 - x;
        }
    }
}