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I was wondering if it's possible to solve nodal analysis problems that include rectangle and polar form using the TI-84. It just gives me an error when I put in "i" as in imaginary when trying to put up my matrix. I've read it's possible to do with the TI-89, but I'd really rather not spend the money if it's possible to do on my current calculator. For example the TI-89 has the "∠" sign which the TI-84 doesn't seem to have, except for the "5e^(90i)" etc which isn't really something I want to use in bigger problems.

Thanks in advance!