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Math Help - Urgent Help: Matrix Addition For X And Y

  1. #1
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    Urgent Help: Matrix Addition For X And Y

    I am suppose to find x and y in the matrix addition problem but just cant get anywhere. The problem is

    Code:
    [2x   4] + [3y  -2] = [-5   2] 
    [-3  5x] + [-2   3]   [-5  13]
    I know that you add 2x+3y = -5 and 4 +-2 etc. but how can I solve for x and y when there is no y on the bottom.

    *I dont have brackets around, but the 2 matrix are 2x2 to = 2x2*
    Last edited by CaptainBlack; September 21st 2006 at 07:58 AM.
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  2. #2
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    If you did not leave a y of the second matrix, then all you have to do is solve:
    2x+3y=-5
    5x+3=13.
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by dekorn24 View Post
    I am suppose to find x and y in the matrix addition problem but just cant get anywhere. The problem is

    Code:
    [2x   4] + [3y  -2] = [-5   2] 
    [-3  5x] + [-2   3]   [-5  13]
    I know that you add 2x+3y = -5 and 4 +-2 etc. but how can I solve for x and y when there is no y on the bottom.

    *I dont have brackets around, but the 2 matrix are 2x2 to = 2x2*
    Write out all the simple equations:

    2x+3y=-5
    4-2=2
    -3-2=-5
    5x+3=13.

    The second and third tell you nothing about x and y, but the fourth
    equation tells you that x=5, and substituting this into the first equation
    gives:

    10+3y=-5,

    so y=-15.

    RonL
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