Re: Help 3 vars. equ's

Subject: Re: Help 3 vars. equ's
From: Johnny \ <jmiyares@MDIHS.U98.K12.ME.US>
Date: Thu, 14 Nov 1996 13:17:30 -0500
In-Reply-To: <328A9669.25E5@bright.net>

On Wed, 13 Nov 1996, aaron wrote:


> My math teacher said that there was a way to use the matrices to solve a
> system of 3 equations with 3 differnt variables. I have a TI-85
>         Does anyone know how to do it????
> please help i hate writing all that stuff out!! hehe :)
>
> Thanks
>




I've got one that will do a system of n equations with n variables that is
based on the fact that any system of equations can be written in the form


[A][X] = [B], where [A] is a matrix of coefficients, [X] is the variable
matrix and [B] is the set of answers.  The solution for [X] = the inverse
of [A] multiplied by [B].  The only trick is that you need to check to see
whether the determinant of [A] = 0 or not to determine if the inverse of
[A] exists, and thus, a solution to the system exists.


I've got it for the 82, and the algorithm is pretty easy to translate for
the 85 if you are interested.  I'll do what I can.


        -- J. Big Dog






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