Sounds to me like you could use Canadian grade 11 math (Trigonometry). Look at it this way:
You have a waypoint. WayPOINT. A point. A point is the location on a grid, it's coordinates. You have the coordinates of the way point, and the coordinates of you. So all you have to do is make it into a right angle triangle (the hypotenuse being the line you will drive on to get to point B. The adjacent, the amount horizontally you will move, and the opposite - the amount vertically you will move (based off of the angle AngleToMove)). So refference Soh Cah Toa. Because we know that you will be going 1 unit up and one to the side, that is our adjacent and opposite. And since Toa deals with that we will use tan, because it is easier that use the length of the hypotenuse.
So:
tan(AngleToMove) = 1/1
AngleToMove = tan^-1(1/1)
AngleToMove = 45° (In Degree mode, it would be 0.7853981634 in Radians)
And if we find the hypotenuse using the Pythagorean theorem 1^2 + 1^2 = c^2 ? 1.414213562, that is the distance to drive.
So, we used 2 coordinates, point A and point B. We found the angle from point A to B, 45°. You aligned the car to 45°. Then you drove 1.414213562 units, and you got to point B from A.
I hope this answers your question. The math will look different in the code, but as long as you understand what's going on it can't be hard. And if you do not, refresh yourself on math with tags: Trigonometry, Soh Cah Toa, Sine, Cos, Tan, Unit Circle, Pythagorean Theorem, and what not.
Besides if you install radar on to that car you need to know how to extrapolate the coordinates of something with the angle and hypotenuse alone haha. Math is fun.... Isn't it awesome that you can do that!
Also you could just calculate the spacial difference, in this example base on your example numbers the difference was one. So drive up one unit, then right one unit. But that will take longer and waste fuel.