For the circuit below, find I, I2, I3, I4, I5, Va, Vb, Vxz (the voltage from node x to node z). Also find the total equivalent resistance, Req, and power supplied by the source, power absorbed by a, b, and xz.
6kΩ 3kΩ I5 M
2kΩ
1kΩ
3kΩ
Vb 6kΩ 1 1A
4kΩ
7Ω