how to calculate "u" and "v" in the following equations?

[milan.km]

Hi
I have to caculate "u" and "v" in these two equations using conjugate gradient.
I have studied conjugate gradient, but solving "u" and "v" through these equations is still vogue to me.
I would really appreciate if sb could give me some hints how o solve it.
thanks so much

 

[andre_luis]

What is impeding you from apply the inverse of each matrix at the left side of equations ?

e.g:
\[u = {{{W}_{Z}}^{-1}}\tau{H}^{T}{D}^{T}y\]