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Math Help - Ti-89 Titanium Solving equation systems

  1. #1
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    Ti-89 Titanium Solving equation systems

    I've got the following two source equitations:
    1.
    (c*ucde + ((l*ilde) + uc)/r + (l*ilde + uc - us)/r) = 0
    2.
    (-c*ucde + il + (alfa*(l*ilde + uc)/r)) = 0

    I'm looking for a symbolic solution in the following format:
    ucde -> -((-2 il r - alfa us)/((2 + alfa) c r))
    ilde -> -((il r + 2 uc + alfa uc - us)/((2 + alfa) l))
    How sholud i enter this question on my Ti-89 Titanium.

    The jpg file contains the solution in the mathematica program, but i need the solution on my TI.89 titanium.
    Attached Thumbnails Attached Thumbnails Ti-89 Titanium Solving equation systems-mathematica_6.0.jpg  
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  2. #2
    Moo
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    Hello,

    I think you should do this way (but I'm not sure because I don't know what these letters represent) :

    solve(first equation and second equation, [x,y])

    where x and y are the variables.


    I put it initially, but it seems that it doesn't look useful without it... I don't know what ilde and ucde represent. But if you're dealing with variables containing more than one letter in their name, I advice you to change their names into single letters.
    Last edited by Moo; May 3rd 2008 at 06:36 AM.
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  3. #3
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    This is what I typed into my TI89:

    solve((c*ucde + ((l*ilde) + uc)/r + (l*ilde + uc - us)/r) = 0 and (-c*ucde + il + (alfa*(l*ilde + uc)/r) = 0, [ucde,ilde])

    This is what I got:
    Error: Argument must be a variable name




    What am I doing wrong?
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  4. #4
    Moo
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    Is ucde a name or u*c*d*e ?

    Because your calculator will understand it as u*c*d*e
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  5. #5
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    Sorry

    solve((c*ucde + ((l*ilde) + uc)/r + (l*ilde + uc - us)/r) = 0 and (-c*ucde + il + (alfa*(l*ilde + uc)/r) )= 0, [ucde,ilde])
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  6. #6
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    ucde, ilde, uc are variable names.
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  7. #7
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    IT WORKS!

    Thank you very match!!!
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