I have a basic circuit in which I am trying to enter both my KCL and KVL equations into my TI Nspire calculator using the "systems of equations" option. I keep getting a "False" for the answer. I am trying to solve for the three variables: is, ia, ib.

The equations are:

Equation#1 KCL at Top Node: -is+ia+ib=0

Equation#2 KVL @ Left Node: -200+is(4)+ia(20)=0

Equation#3 KVL @ Right Loop: ib(80)-ia(20)=0

When I tell Maxima to solve ([ ia + ib - is = 0, 4*is + 20*ia - 200 = 0, 80*ib - 20*ia = 0 ], [ia, ib, is]);

it tells me there is exactly one answer,

[[ ia = 8, ib = 2, is = 10 ]]

Maple agrees, too.

Thank you all for your help,

CJ