moving images at angles

How would I move an image on a straight line between two points?
I understand simple vertical and horizontal movement, but am having trouble grasping movement at an angle.
I would like the image to move from (for example) x=500,y=500 to x=200,y=350.
Are there functions that move an image from point-to-point?

Get the angle with

Angle=Atan2(ToY-FromY,ToX-FromX)

and then move it by

X:+Cos(Angle)*Speed
Y:+Sin(Angle)*Speed

Of course, your position variables will need to be floating point to keep everything smooth.

Gabriel -
thank you - works perfectly!