50g

> That was exactly what I thought, (having to delete or rearrange the
> formulas).  If I'm guessing correctly, the numeric solver is for
> creating a 'quick' solver on the fly.  

Generally it is used for solving a single unknown in a single
equation.  You can also write something like 'FUNC(X,Y)=X^2+Y' and hit
the DEF key (2) to define a little function solver that takes stack
input.  When you define a function to graph, one is automatically
created for you. How handy!

There is one additional solver in the 50 not in the 48s.  This is the
MSLV command which is a non-linear series numerical solver.  Takes a
lot of inputs though and is kind of slow.  Worked great at number
crunching for my statics/dynamics though.  Then I discovered matrices
and could solve everything in one go. :-)  

 
> I have an advanced users manual for the 48gx somewhere.  How different
> would that manual be for the 50g?

They lifted several chapters directly out of it for the 49/50AUR. 
Just remember the CAS only likes to be in radians, and a plain number
without a dot '5 vs 5.' is a symbolic integer and you'll be fine.

I don't remember correctly if the equations library solver on the 48
solved units as well. . .

TW