My circuits analysis textbook teases that there's a way to convert a set of n complex equations into a set of 2n real equations, which can then be solved using any calculator that can solve real simultaneous equations. That is, no capability with complex numbers needed.
e.g.:
$(25 +j100)I_1 - (10+j80)I_2=100\angle0^\circ\\$ (1)
$-(10+j80)I_1+(30+j190)I_2=0$ (2)
I say "teases" because they point me to their website, where after a lengthy sign-up process, I find that the material isn't actually there.
Does anybody know what method they're referring to?
I know how to do this with Cramer's Rule, but that requires a matrix calculator that understands complex numbers (they exist but they're not common).
Here's the page: