(TI-83) How do I store a formula as text?

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(TI-83) How do I store a formula as text?

I have a TI-83 and want to store some basic formulas for reference.


For example, I'd like to store "D=(I-A)X" somewhere.


I tried the List function, but continually get syntax errors for the =
symbol.


I currently have this little formula, and "X=(I-A)-1D, stored as programs,
which I can only access by the "edit" command under program.


Is there a better way to store this information?


Thanks in advance.


bill