Finding the consistant slope

i trying have ball move 1 side of stage exact x , y points on other side of stage. example, let's ball's x =25 , y=80, , point want move @ point x=350 , y=100. if want ball travel @ consistant speed (doesn't matter), how this?

does make sense? it's simliar movie clip following mouse, sort of...help please.

is speed fixed? if not, had change x , y position constantly, guess wouldn't have asked then.
so when it's fixed, need know distance start end point. know both points, can use
distance = math.sqrt( math.pow(startpoint._x - endpoint._x, 2) + math.pow(startpoint._y - endpoint._y, 2) );
this gets length of line between points in pixels.
then can time take go distance in given speed:
time = distance / speed;

now if speed 50 pixels per second, time in seconds, , 5 seconds. take animation speed (e.g. framerate, if animate onenterframe), , number of animation steps take reach end:
steps = time * animation_speed

finally total distances x , y, endpoint.(x | y) - startpoint.(x | y), , divide steps number distance each step:
stepx = (endpoint._x - startpoint._x) / steps;
stepy = (endpoint._y - startpoint._y) / steps;

now have distance each animation step , can use them in animation move ball given speed.

hth,
blemmo

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