SOLUTION: The first two rows of the following matrix are already in triangular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you ha

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Question 626978: The first two rows of the following matrix are already in triangular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you have done so?
[1 6 -2 0]
[0 -3 1 5]
[2 0 3 9]
I really dont get this
Answer by stanbon(57224) About Me  (Show Source):
You can put this solution on YOUR website!
The first two rows of the following matrix are already in triangular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you have done so?
[1 6 -2 0]
[0 -3 1 5]
[2 0 3 9]
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Subtract 2 times the 1st line from the 3rd line to get:

[1 6 -2 0]
[0 -3 1 5]
[0-12 7 9]
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Ans: [0 -12 7 9]
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Cheers,
Stan H.
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