I've got the following two source equitations:

1.

(c*ucde + ((l*ilde) + uc)/r + (l*ilde + uc - us)/r) = 0

2.

(-c*ucde + il + (alfa*(l*ilde + uc)/r)) = 0

I'm looking for a symbolic solution in the following format:

ucde -> -((-2 il r - alfa us)/((2 + alfa) c r))

ilde -> -((il r + 2 uc + alfa uc - us)/((2 + alfa) l))

How sholud i enter this question on my Ti-89 Titanium.

The jpg file contains the solution in the mathematica program, but i need the solution on my TI.89 titanium.