Linear Algebra 9k: Gaussian Elimination Example 3

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While switching rows 1 and 3 you forgot to at least mention that the rows at the right hand side must be switched as well. As both entrys are zero this is of course unnecessary, but this might confuse people not that familiar with gaussian elimination.

Zhardamon
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I can see how the alpha null space works ...but I wanted to have 3 dimensions alpha beta gamma of null space with alpha[2, 0, 0, -1] beta [0, 2, 0, -1] gamma[0, 0, -2, 1] ....why is that wrong?

redberries