Solution: Solve Gaussian Elimination | 2x1 + 1x2 = 4

AI Thread Summary
The discussion focuses on solving a system of equations using Gaussian elimination. The user seeks assistance in eliminating values below the leading coefficient in the first column, specifically mentioning the operation R3 + 7R2 to simplify the matrix. This operation transforms the third row into a more manageable form, allowing for easier calculations. The user expresses that mastering this technique takes practice and appreciates guidance due to inadequate explanations in their textbook. Overall, the conversation highlights the challenges of learning Gaussian elimination and the importance of step-by-step problem-solving.
TonyC
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2 1 1 | 4
-1 2 1 | 3
7 6 5 | 19

Need a little help please
 
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Im not going to do the whole thing, but I like to try and eliminate the stuff below the top left number first.

Say, R3+7R2, will get rid of the -7. And will make the bottom row 0 20 12 | 40, id then divide by 2. Makes things easier. Then move onto another number.

I used to really suck at this, it takes a lot of goes before you can do it without trouble.
 
Im not going to do the whole thing, but I like to try and eliminate the stuff below the top left number first.

Say, R3+7R2, will get rid of the -7. And will make the bottom row 0 20 12 | 40, id then divide by 2. Makes things easier. Then move onto another number.

I used to really suck at this, it takes a lot of goes before you can do it without trouble.
 
Thank you, the book doesn't explain to good and I just needed a jump start.
 

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