Wye - Delta conversion and Mesh Analysis

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Homework Statement

a) Use Y-Δ transformation to simplify the circuit in Figure 2-a to that in Figure 2-b and find the elements and values of Z1, Z2 and Z3

b) Use mesh analysis for the circuit in Fig. 2-b to calculate I1 and I2

Here are the circuits.

http://i1233.photobucket.com/albums/ff390/wklols/c1.png

Homework Equations

The Attempt at a Solution

a) I'm not sure what to do to be honest.

Do I convert the delta to wye form?

So each 'branch' be equal to (-39j)(-39j)/(-39j-39j-39j)= -12j?

So now would I have the three branches with -12j and 12j+9Ω= 9Ω ?b)

-240+(4+z2)(i2-i1)+(4+z3)i2=0
-240+(4+z3)(i1)-(4+z3)(i2-i1)=0

And that's about all I can do.

 

[_coyote_]

I've tried solving for z2 and z3 but I always get stuck eventually. Any help would be great, thanks!