[Blindmath] accessible graphing solution

[Aleeha Dudley]

Hi all,
  Sorry if this has been asked before, but I cannot find a 
definitive answer on performing a Google search.  Is there an 
accessible graphing solution that can at least do x-y plots and 
least squares analyses? I will be taking a 100 level college pre 
calculus course next semester, so I am also looking for a 
solution to handle that material.
Thank you,
Aleeha