Using LabView to make Robot track the trailer

[rsisk]

Our image tracking algorithim gives us two outputs, how much the image is off of center and how much larger/smaller the image is.

For example

So when the image moves slightly to the right, we would send a +.2 to both motors to make it move slightly to the right.

If the image becomes smaller (moving slightly away) we would send a +.2 to one motor and a -.2 to another motor to move the robot towards the target.

My question, if the robot move slightly to the right and slightly further away in one motion, what signal would we send to the motors to move the robot both forward and to the right in one motion?

And, how do I calculate that mathematically.