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Matrix Problem Help !!!

I am new to solve matrix using labview.
I have this
equation
Vt = Ia*Ra + Wm*Km
 
Vt = 10X1 matrix
Ia = 10X1 matrix
and Wm = 10X1 matrix
 
I want to solve Ra and Km
I have tried to solve it by using
[Vt] = [Ia ; Wm]* [Ra Km]'
 
it becomes a
[10X1]= [10X2] * [2X1]    matrix
 
A=B *[Ra Km]'
solving it by
inverse(B)*A = [Ra Km]
this style cant work ......
cause B can not be inverse as it is not a square matrix ....
Any idea how to solve Km and Ra ???
 
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I have already found a soultion to this problem ...
Thanks
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