Issue with Gaussan Row reduction in singular system

Hi,

I tried to use Gaussan Elimination on the matrix below and came up with a different answer than what was presented. Can you please let me know where I went wrong?

Here is my work:

Thank you for your help! Just noticed the -9 in my solution. It should be a 0.

That’s an error in the video. It’s been reported and hopefully will be fixed soon.

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