## Gaussian Elimination: x+y+z=5, 2x+3y+5z=8, 4x+5z=2

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
Monica
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Joined: Wed Oct 12, 2016 11:18 pm
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### Gaussian Elimination: x+y+z=5, 2x+3y+5z=8, 4x+5z=2

Please help me. I have no idea how to solve this problem. How do I even start?
x+y+z=5
2x+3y+5z=8
4x+5z+2

1 1 1 5
2 3 5 8
4 0 5 2

1 1 1 5
0 1 3 -2
4 0 5 2

1 1 1 5
0 1 3 -2
0 -4 1 -18

1 1 1 5
0 1 3 -2
0 0 13 -26

plus there are arrows connecting the rows of numbers together. what's that all about?

buddy
Posts: 197
Joined: Sun Feb 22, 2009 10:05 pm
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### Re: Gaussian Elimination: x+y+z=5, 2x+3y+5z=8, 4x+5z=2

there are arrows connecting the rows of numbers together. what's that all about?
The arrows (which we can't see) are probably what they show here.
Please help me. I have no idea how to solve this problem. How do I even start?

Solve by Gaussian Elimination:

x+y+z=5
2x+3y+5z=8
4x+5z+2
They were supposed to cover this in your book and in class. To learn what they skipped, try here.