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version 1.2, 2002/07/18 15:52:27 version 1.3, 2005/02/15 14:59:30
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  Problem Parameters'' figure.    Problem Parameters'' figure. 
   
 When creating randomized problems, you want to make sure that the problems  When creating randomized problems, you want to make sure that the problems
 always have an answer. Consider what might happen if I had chosen the two  always have an answer. Consider what might happen if two
 slopes \emph{both} with the expression \texttt{\&random(-1.0,1.0,.2)}. One  slopes are chosen, \emph{both} with the expression \texttt{\&random(-1.0,1.0,.2)}. One
 out of ten students would get a problem where both slopes were equal, which  out of ten students would get a problem where both slopes were equal, which
 has either no solution (for unequal y-intercepts) or an infinite number of  has either no solution (for unequal y-intercepts) or an infinite number of
 solutions (for equal slopes and y-intercepts). Both of these cause a division-by-zero  solutions (for equal slopes and y-intercepts). Both of these cause a division-by-zero
 error on the division that computes the answer. There are many ways to avoid  error on the division that computes the answer. There are many ways to avoid
 this, one of the easiest of which is picking one slope negative and one positive.  this, one of the easiest of which is picking one slope negative and one positive.
 This same problem can show up in many other places, too, so be careful.  This same problem can show up in many other places as well, so be careful.
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