[futurebasic] How do you find the point where two lines cross?

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From: JoeAtTIME@...
Date: Thu, 3 Jun 1999 08:01:30 EDT
I want to write a function that will take the x and y coordinates of the end 
points of two lines and return the coordinates of the point where the lines 
cross, if they do.

I thought was going to be easy to solve but so far I can't. I wish I had paid 
more attention in Geometry class. Can anyone give me some pointers on how to 
approach this problem?

-Joe Lertola