Need help programming my TI-85

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Need help programming my TI-85

I have a conics program for a TI-81 that I am trying to insert into my
TI-85 but it does not seem to work.  The program is supposed to take
values of an equation of the form Ax^2 + By^2 + Cxy + Dx + Ey + F = 0 and
solve for y. A problem arises when the calculator has to substitute the
values of A,B,C,D,E, and F into an equation that contains the unknown
variable x.  An undefined arrow occurs as there is no value for x.  Also
the calculator is not able to store the equation and then insert it into
the graphing prompt y1 so that the conic can be graphed.  Could some one
please help me.