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Math Help - How to solve complex number equations with a calculator?

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    5

    How to solve complex number equations with a calculator?

    Let x,y be in the complex plane

    Say,
    (1+i)x+ (2+i)y -5 = 0
    (3+2i)x + (4+i) -10 = 0

    I couldn't solve such a system of equations with neither of casio fx-9750g, hp 50g and TI-89..

    Any help would be appreciated. Thanks in advance.
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  2. #2
    Newbie
    Joined
    May 2008
    Posts
    18
    Hi. I never solved a system of equations like this in a math class, but I think I know how to do it on a TI 89 Titanium.

    First, I have a question about your second equation. It reads (3+2i)x + (4+i) -10 = 0 Is there supposed to be a y after the (4+i)? If there is, here is how to do it on a TI 89.

    You can solve this using the Simultaneous Equation Solver Flash App. (This can be downloaded for free from TI's website).

    Then enter the coefficents of x and y like in the first screenshot, and finally hit F5 to solve. The answer screen is in the second screenshot.

    If there is not supposed to be a y in the second equation, you could just solve it for x and then plug it in to the other equation using the substutition method. (All of this could be done on a calculator), or you could solve it as a system using the same method described above making the coefficent of y 0 and moving the term (4+i) to the other side of the equation.
    Attached Thumbnails Attached Thumbnails How to solve complex number equations with a calculator?-screen01.bmp   How to solve complex number equations with a calculator?-screen02.bmp  
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