50g

hi, im having some basic problems, i just bought my 50g but there are
some basic thing i dont know how to do, like solving systems of
equations of 3 unknowns, like:
 3a-2b+1c=4
 a+4b-5c=7
 5a-6b-9c=19

for that kind of equations im still using my casio calculator =( , so
i hope you can help me, thanks!

If you know how to use matrices, you can just "divide" the column 
vector [4 7 19] by the coefficient matrix [3 -2 1 ...].  The matrix 
writer makes it easy to enter matrices.  Download the User's Guide to 
see lots of different ways of solving systems.  (I'm just learning 
myself.) 

Richard in NC 

--- In 50g@yahoogroups.com, "missing_u1905" <missing_u1905@...> wrote:
>
> hi, im having some basic problems, i just bought my 50g but there 
are
> some basic thing i dont know how to do, like solving systems of
> equations of 3 unknowns, like:
>  3a-2b+1c=4
>  a+4b-5c=7
>  5a-6b-9c=19
> 
> for that kind of equations im still using my casio calculator =( , 
so
> i hope you can help me, thanks!
>

--- On Wed, 1/14/09, missing_u1905 <missing_u1905@...> wrote:

> hi, im having some basic problems, i just bought my 50g but
> there are
> some basic thing i dont know how to do, like solving
> systems of
> equations of 3 unknowns, like:
>  3a-2b+1c=4
>  a+4b-5c=7
>  5a-6b-9c=19
> 
> for that kind of equations im still using my casio
> calculator =( , so
> i hope you can help me, thanks!

One way (page 9.9 of the Users Manual):
Use <right-shift,7> (NUM.SLV) to invoke the numerical solver.
Pick 4 (Solve lin sys...).
Enter the coeeficients into A: [[3,-2,1],[1,4,-5],[5,-6,-9]]
Enter the constants into B: [4,7,19]
With cursor in X, press <SOLVE>

-- 
pDale

By the way, when entering matrices and vectors using square brackets 
instead of the matrix writer, commas are kind of inconvenient and messy 
looking.  In RPN mode you can just use spaces between numbers.  
Example: [[1 2 -5][2 1 7][4 4 0]] is a square matrix with rows 1,2,-5 
etc. [[3][-1][5]] or simply [3 -1 5] works like a column vector.  Use 
double brackets for a row vector: [[1 -5 32]].  You can't do it this 
way in Algebraic mode as it would interpret juxtaposition as 
multiplication.

Richard in NC