VectorExtensions.cs

public static class VectorExtensions {
    public static Vector2 Add(this Vector2 vector, float x = 0, float y = 0) {
        return new Vector2(vector.x + x, vector.y + y);
    }

    public static Vector3 Add(this Vector3 vector, float x = 0, float y = 0, float z = 0) {
        return new Vector3(vector.x + x, vector.y + y, vector.z + z);
    }

    public static Vector2 Scale(this Vector2 vector, float x = 1, float y = 1) {
        return new Vector2(vector.x * x, vector.y * y);
    }

    public static Vector3 Scale(this Vector3 vector, float x = 1, float y = 1, float z = 1) {
        return new Vector3(vector.x * x, vector.y * y, vector.z * z);
    }
}