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Confusion with how to make an augmented matrix

  1. Jan 28, 2017 #1
    1. The problem statement, all variables and given/known data
    So in the attachment you'll see a picture taken from a linear algebra book where a linear system of equations is presented in the equivalent augmented matrix form. I'm confused about the representation of the first equation in the augmented matrix. What happened to the constant 4? Shouldn't the first row in the matrix be [ 0 -1 -1 1 | -4 ]?

    2. Relevant equations


    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jan 28, 2017 #2

    Stephen Tashi

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    Science Advisor

    Yes, it should be. The "4" in the first equation is probably a misprint.
     
  4. Jan 28, 2017 #3
    Ah ok, good. I thought I was going crazy for a second there.
     
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