Question about Texas Instruments TI-89 Calculator

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How do you plot two liner equations on a ti-84?

The problem is i cant graph two lines on my calulator the equations are (2/5)x-(11/5)
-3x+8
how do i graph them at the same time?

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I use one of the graphing APPS or do through a program. I have a users manual for TI 84 silver Edition that shows you how to archive\ unarchive to run programs here at this site. Usually, I tell people to just forget about the programs and use the simple concepts so, that they could operate their calculator better. But, if you notice in those program are actually more powerful than the programs you get on the web, because I wrote them to be flawless, or I only used programs that I knew would not clash and were very well written. Won't y1=(2/5)x-(11/5) and -3x+8 work?

y1=(2/5)x-(11/5) and -3x+8

Posted on Sep 29, 2009

  • 19 more comments 
  • Richard Klein
    Richard Klein Sep 29, 2009

    That might not work. I load my Ti 84 to a student so, I can't test. But, I know there is APPS, and programs that well, even though be real care what you download from the web. Ticalc has some bad programs but, won't they won't crash you as hard as some of the other site.

  • Richard Klein
    Richard Klein Sep 29, 2009

    Here better yet!
    I have a program from this site 5 years ago. I can't seem to find it on a web search, maybe you'll have better luck.
    Try doing a search in ticalc.com for. You may find other programs too.
    henkshoeke.com/English/revolxas.htm


  • Richard Klein
    Richard Klein Sep 29, 2009

    If you can find a program name Bigslope.8xp is a real powerful program that will allow multiple graphs. HGGPFRAC.8xp is a very good pratial fraction program too. I know it is in ticalc.com

  • Richard Klein
    Richard Klein Sep 29, 2009

    I know that equation will work. you just have to set it up right. You just have to set it up using While or some other boolean function.

  • Richard Klein
    Richard Klein Sep 29, 2009

    There's a way to do exactly what you want and I gave really have given it to you and you can see it see. Did you try putting a , between them both?

  • Richard Klein
    Richard Klein Sep 30, 2009

    Try using the when( command. I'll download a simulator and solve this for you. I know there's away to do it because we were doing it in out Calc 2. So don't lock me out.

  • Richard Klein
    Richard Klein Sep 30, 2009

    That makes me think of other ways too. I only wished Ti 84's were as forgiving as the Ti 89's. That is a good idea now lets prove it with the Ti84.

  • Richard Klein
    Richard Klein Sep 30, 2009

    Even if you do get the Ti 84 calculator to do both equations on the same line it is not going to be completely simatenuosly. It will draw a little bit of one of the equations and then a little bit of the other. It is not going ot be simultaneous. Do you still want the y1=when(2/5)x-(11/5)... , -3x+8...) solution? I know it don't work in the form it is. But, it will when I finish getting the proper set up, if you don't know already. Please post a comment on exactly what you wish done. It will help in arranging the proper solution.

  • Richard Klein
    Richard Klein Sep 30, 2009

    I bet these newer OS won't allow you to do this.I think that is why were being asked all the time to do it.

  • Richard Klein
    Richard Klein Oct 01, 2009

    See if you use Y1=while x<1 (2/5)x-(11/5),... and while x<1... -3x+8 you just expand it!

  • Richard Klein
    Richard Klein Oct 01, 2009

    I have already answered this question. You can't graph at the same time because, it will do one a little bit and then stop. Then it will graph the other line a little bit, and stop. Just keeping going back and forth until it is done. Not the same time! Now it will preform slow, and if your memory is loaded you could crash. Why didn't you ask about the isotopes leaving their own center of mass? or partial fractions or my favorite characteristic equations g1 g2 /(1+g2 h2)..

  • Richard Klein
    Richard Klein Oct 01, 2009

    You won't graph both at the same time unless, you go to basic, assembler, or C+++, or an APP.

  • Richard Klein
    Richard Klein Oct 01, 2009

    Does it go back, and forth for you guy's too?

  • Richard Klein
    Richard Klein Oct 02, 2009

    How far have you got to making it work? Errors? Do you understand or are you doing the proper procedures?

  • Richard Klein
    Richard Klein Oct 02, 2009

    I found another way to do this but, it require assembler and a special character in the command line Y(1)= $
    So there is plenty of ways to do it. Hope this helps!


  • Richard Klein
    Richard Klein Oct 04, 2009

    This question is the same way. What will work on my calculator will not work on yours. But, I'm sure this will work on any calculator. You just have to have the command structure, mode settings, system variables and assembler programming .
    Here's another way I've been doing two equation on one line at the same time.

    y1(x)=(2/5)x-(11/5) Actually a place holder
    y2(x)=-(3x+8) Actually a place hold
    y3(x)=([y1(x), y2(x)])
    Crunch the data in program and draw as xy points and draw line enable "at the same time" to display on the graph instead of incrementally done. It operates a lot faster, its not going back and forth wasting time. the trace works better too. You also have to make logical decisions on how your curves flow. But, it would work pretty easily. You just enter equations in the place holders.

  • Richard Klein
    Richard Klein Oct 04, 2009

    How can I answer this question. The title is to Plot on graph and the question is to use the function graph. I actually turn my data into to plots. I'm not using the system plots. You want plots just plot [y1(x),y2(x)].

  • Richard Klein
    Richard Klein Oct 08, 2009

    y1(x)=If or while (x1,0,10..5) then (x2,0,10,.5)

  • Richard Klein
    Richard Klein Oct 29, 2009

    I quit

  • Richard Klein
    Richard Klein Oct 21, 2012

    The Ti 84 must have the correct os. Newer os don't work so good.

  • Richard Klein
    Richard Klein Oct 30, 2012

    Can't post picture of my Ti 84 graphing the 2 equations at the same time with the later os installed on it.

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Hello,
On the Ti89 you cant draw a large number of functions (not only linerar) on the same graph.Open the function editor screen [Diamond][Y=] and on each line where is a Yn (n=1,2,3 etc. ) you can enter the expression for a function. When you have finished press [Diamond][Graph] and the graphs of all the function that you defined will be drawn, either simultaneously or one after the other.
Hope it helps.

Posted on Sep 29, 2009

  • k24674 Sep 30, 2009

    For the TI84Plus, drawing two fuctions on the same graph is done by simply entering the fucntions in the [Y=] editor, then pressing [GRAPH]. You can draw as many as 10 functions. Wether drawn simultaneously or in sequence is irrelevant. At the end all graphs will be on the screen. All can be traced:You can jump from one to the other and read off x, an y, values as well as derivatives (if so configured.)

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