I was able to get #9 correct, but could not get the same answers in #10 and #11. The loops with current sources seem to be screwing me up.

Loop analysis method is essentially as follows; draw loops currents, assign polarities, write KCL equations, solve.

For #9, my loop equations are:

Loop 1: i1 = 2

Loop 2: 40 - 4*i2 + 4*i1 - 20 - 2*i2 - 4*i2 + 4*i3 = 0

Loop 3: 10 +4*i3 - 4*i2 = 0

... right

Using matrix algebra to solve, I get... (These results were confirmed with multisim)

i1 = 2

i2 = 3

i3 = 1/2

For #10, my loop equations are:

Loop 1: i1 = 2

Loop 2: i2 = 2

Loop 3: 10 +4*i3 - 4*i1 = 0

... wrong

For #11, my loop equations are:

Loop 1: i1 = 2

Loop 2: 40 - 4*i2 + 4*i1 - 20 - 2*i2 - 4*i2 = 0

Loop 3: i3 = 2

... wrong

Any help would be great, thanks for reading.