using System;

using System.Numerics;

public class Program

{

    public static Vector2 PointOnLine(Vector2 a, Vector2 b, float offset) {

        Vector2 delta = b - a;

        Vector2 unit = delta / delta.Length();

        return a + (unit * offset);

    }

    public static void Main()

    {

        Vector2 result = Program.PointOnLine(new Vector2(0, 0), new Vector2(10, 0), 4);

        Console.WriteLine(result);

        result = Program.PointOnLine(new Vector2(0, 0), new Vector2(10, 10), 4);

        Console.WriteLine(result);

    }

}