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!
>

simultaneous equations:
go to numeric solve,
choose solve linear
go to MTRW (matrix writer)
enter numbers in brackets [4 -5 8] with a space between the numbers
then choose solve
you can then choose view for a better view of the results

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

From: missing_u1905 <missing_u1905@...>
Subject: [50g] how to use it
To: 50g@yahoogroups.com
Date: Wednesday, January 14, 2009, 12:40 AM

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