The question came up as I was solving a problem in another Forum:

$\displaystyle \left [ \begin{matrix} a & b & c \end{matrix} \right ] ~ \left [ \begin{matrix} 28 & 91 \\ 453 & 712 \\ 9012 & 1024 \end{matrix} \right ] = \left [ \begin{matrix} 81.534 & 49.091 \end{matrix} \right ] $

Mathematica is not letting put this in so I can solve for a, b, c. And yes I know I have too many degrees of freedom. I was going to use a = 1, but I can't set this up. Mathematica won't even let me put in the LHS. I can solve this problem if I write it as a system of equations. I just can't get it to go in matrix format.

Does anyone have any thoughts?

-Dan