Can you solve for the currents using Kirchhoff's law?

[Algebrawhore]

Homework Statement

Using Kirchhoff's law for nodes A,B,C and D and then Kirchoff's law for the circuits around the main building, the annex and the warehouse, write a system of seven equations that could be solved for the currents I1, I2, I3, I4, I5, and I6

I get (NOTE**the I are capital i, not one)

The Attempt at a Solution

I1-I2-I3=0
I3-I4-I6=0
I4-I5+I6=0
-I1+I2+I3=0
10I1-20I2=400
10I4-RI6=0

My answer seems to be wrong, please help!

Thanks

 

[lippyka]

! The correct answer should be: I1 - I2 - I3 = 0I3 - I4 - I6 = 0I4 - I5 + I6 = 0-I1 + I2 + I3 = 010I1 - 20I2 + I5 = 40010I4 - RI6 = 0I5 - I6 = 0