Re: TI-M: Re: Equation question for TI-89
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Re: TI-M: Re: Equation question for TI-89
BG,
"and" goes in place of "and" I showed exactly how it would be inputted on
the command line (with spaces added between operators for an easier read on
the computer):
solve(-1 = -1a + 3b and 3 = 2a-5b, {a,b})
Just enter it in exactly as shown (well, without the spaces before and after
operators). Yes {a,b} should have the curly brackets around it, because it
is a _list_ of all variables you want to solve for.
>From: BG <gloverbo@msu.edu>
>Reply-To: ti-math@lists.ticalc.org
>To: ti-math@lists.ticalc.org
>Subject: Re: TI-M: Re: Equation question for TI-89
>Date: Fri, 15 Sep 2000 13:32:20 -0400
>
>
>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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