Midpoint of Triangles

[johnny101]

So I know this problem is simple but I'm having trouble with it:

I have a right triangle as follows:

90degree corner lines up with Y/X vertices, and the point there is O.
Directly above point O is point Y(0,y).
The point to the right of point O is point X(x,0).

Find the slope of OM if M is the midpoint of XY.

I have it as -y/x, but that doesn't seem right?

 

[stapel]

So I know this problem is simple but I'm having trouble with it:

I have a right triangle as follows:

90degree corner lines up with Y/X vertices, and the point there is O.
Directly above point O is point Y(0,y).
The point to the right of point O is point X(x,0).

Find the slope of OM if M is the midpoint of XY.

I have it as -y/x, but that doesn't seem right?

How did you arrive at your answer? Why do you feel it is incorrect?

Please be complete. Thank you! ;-)