TI-89 Simultaneous Equations

Hi all,

I just got a TI-89 the other day and I've been trying to figure out the simultaneous equations application. I see you can do it easily if the equations are in the form x+y=b but how do you enter an equation in the form xy=b? It seems that the table you enter values into only deals with addition of the different variables and not multiplication.

The manual is absolutely no help on this issue, so any help would be greatly appreciated.

Thanks.
.