Re: Ti and inequalities

Subject: Re: Ti and inequalities
From: Riley McArdle <mechsys@WORLDNET.ATT.NET>
Date: Wed, 2 Oct 1996 00:06:28 GMT
In-Reply-To: <Ti and inequalities>

What do you mean?  Like "y=2<x<5"???  Just enter "Y1=(2<x) and (x<5)".  This
works because of boolean algebra.  The calculator interprets it like this:


Y1=(2<x) and (x<5)


Say x=4
(2<x)           two is less than x
        true or 1 (true = 1)
(x<5)           x is less than 5
        true or 1 (true = 1)
1 and 1         1 is non-zero and 1 is non-zero (zero is false)
        true or 1 (true = 1)


So the calculator graphs a point at (4,1)


Another Example:


Y1=(2<x) and (x<5)


Say x=6


(2<x)           two is less than x
        true or 1 (true = 1)
(x<5)           x is less than 5
        false or 0 (false = 0)
1 and 0         1 is non-zero and 0 is non-zero (zero is false)
        false or 0 (false = 0)


So the calculator graphs a point at (6,0)


TI calculators can do a lot, you just have to know how to tell them what do
do.


Riley McArdle
mechsys@worldnet.att.net
http://www.student.toplinks.com/hp/griffon/


Simone P Powell <spowell@sun1.iusb.edu> wrote in article
<52s5hu$g0k@mercury.iusb.edu>...
> I like the TI calculators, but I am disappointed in their ability to graph
> inequalities.  How about you?  It's not even worth the effort to figure out
> how to graph inequalities with their calculators.  What I need is a program
> written to graph inequalities.  Does anyone know why I can download one?
> I will need one in the next couple weeks.  I am a mathematics teacher and
> we will start inequalites soon.  Thanks for your help.
>
>
> Sam Powell
> Northridge High School
> Middlebury In
>
>

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