Re: TI-M: Re: Equation question for TI-89
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Re: TI-M: Re: Equation question for TI-89
Mike,
Thank you for explaining that to me.
I used the rref( ) function you suggested and found it works perfectly for my
needs. Thanks a lot!
But for the solve( ) function I keep getting a syntax error ("too many
arguments"); I'm not exactly sure how to enter it using the solve function. I
believe I am doing something wrong.
"solve(-1 = -1a + 3b and 3 = 2a-5b, {a,b})"
where the word 'and' is, what should I use? a "," or perhaps a ";"? Also,
do I literally put the brackets around a and b "{a,b}" ?
At any rate, thanks a lot for the help. I can now use the rref for any of my
needs. I guess my curiosity in the solve function is just academic at this
point. Thanks!
BG
Mike Grass wrote:
> You can always look up the manual at TI's web site....
>
> The 89/92+ have a great built-in linear systems of equation solver, just
> enter
>
> solve(eqw1 and eqw2, {varlist})
>
> Using your example, you would type
>
> solve(-1 = -1a + 3b and 3 = 2a-5b, {a,b})
>
> which returns
>
> a=4 and b=1
>
> If you want to do it with matrices, you can use rref(--which finds the
> reduced row echelon form--on the standard augmented matrix:
>
> rref( [[-1,3,-1] [2,-5,3]] )
>
> which returns
>
> [[1 0 4]
> [0 1 1]]
>
> --Mike
> ----- Original Message -----
> From: "BG" <gloverbo@msu.edu>
> To: <ti-math@lists.ticalc.org>
> Sent: Thursday, September 14, 2000 10:38 PM
> Subject: TI-M: Equation question for TI-89
>
> >
> > Hi everybody,
> >
> > I'm new to this list. I have a question that probably has an easy
> > answer.
> > I am about 50 miles away from my TI-89's manual, so unfortunately I
> > can't find my answer there.
> >
> > PROBLEM: how can I enter a system of equations into my TI-89 and have
> > it solve them?
> > For instance:
> >
> > -1 = -1A + 3B
> > 3 = 2A - 5B
> >
> > What do A & B equal?
> >
> > This is two equations with 2 unknowns. Isn't there a function to solve
> > this? Can't I do this with a Matrix? If so, could somebody please tell
> > me how to do it on a TI-89? I'm going to need to be able to do it with
> > 3 equations and 3 unkowns, also. I have an old Casio that I can do it
> > on, but my 89 is a great calculator and I'd like to use it for all my
> > needs.
> >
> > Thanks!
> >
> > B. G.
> >
> >
> >
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