General answer:

If we have two functions y1=f(x) and y2=g(x), we find the point(s) of
intersection by setting y1=y2 [f(x)=g(x)]and solving for x.

Specific case:

directly proportional function y1=f(x)=ax
indirectly proportional funciton y2=g(x)=b/x
set them equal ax=b/x - x^2=b/a - x=+/- sqrt(b/a)

I leave it to you to decide if you want the positive root or the
negative root, or if I have correctly/incorrectly interpreted the form
of your functions.


--
MrShorty
------------------------------------------------------------------------
MrShorty's Profile: http://www.excelforum.com/member.php...o&userid=22181
View this thread: http://www.excelforum.com/showthread...hreadid=480125