Why am I getting a zero determinant for the matrix: -2 1 1 1 -2 1 1 1 -2
if the column or row vectors don't seem linearly dependant?
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Look at the webpage.
Add the first row to the 2nd and you get -1 times the third row. So indeed they are not independent equations.
... And it was.
Just lack of fluency with the application of linear algebra definitions...
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