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Math Help - Working with identity and transpose matrices

  1. #1
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    Unhappy Working with identity and transpose matrices

    hi everyone,

    im trying to solve (I - A(transpose))y = c

    i tried to do this in 2 different methods. can you please see my files attached?
    method 1...i have followed all the rules of mathematics properly (no??) and i got a different (wrong) answer, compared to method 2. why is this? does anyone know? what rule am i breaking or what am i not doing?

    thank you all!!
    Attached Thumbnails Attached Thumbnails Working with identity and transpose matrices-2.jpg   Working with identity and transpose matrices-1.jpg  
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  2. #2
    A Plied Mathematician
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    Well, your Method 1 is solving the equation (I-A)y=c, not (I-A^{T})y=c. That could be part of the problem. You've skipped too many steps for me to easily see what might be going on in Method 2.
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  3. #3
    Senior Member BAdhi's Avatar
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    method 1
    line before last line 4(2x-10)=8x-40 not 8x-10
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  4. #4
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    actually i copied and pasted wrong in word. i will redo it.
    i copied in matrix A , when my working was correct. i.e. (I - At ) y = c working is correct. i will try to make this clearer
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  5. #5
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    ah thanks!! wow. completely missed that :/
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