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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

Hi I have question that

Question is 2x1+2x2+2x3=0

-2x1+5x2+2x3=1

8x1+x2+4x3=1 solve by echlon fom and write correspondence eq

I solve echlon form and answer is

1 1 1 0

0 1 4÷7 1÷7

0 0 0 0 this is row echlon plese help it to solve x1 Y1 AND z1 from ans

Math !!!!.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Did you use Gaussian Elimination?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

No

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

How did you get that RREF?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

I solve it by doing row operations

Math !!!!.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Are you aware that the system of equations you gave do not have a solution?

If I can remember, when you get your RREF you back substitute to get the answer. Why they would give you one that has no answer I do not know. Did you copy the problem correctly?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

You say that it is impossible? ??

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Not impossible but it has no solution. In other words, there is no x1, x2, and x3 that makes all 3 equations true.

There is probably an error in copying the problem.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,018

Eliminating x1 from the 3 equations we get

7x2+4x3=1 and

7x2+4x3=5/3

They are inconsistent.

However if we had got same number on right hand side it would have multiple solutions.

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

No I want ans in corresponding equation mean give ans what is x1 value etc

Math !!!!.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Not impossible but it has no solution. In other words, there is no x1, x2, and x3 that makes all 3 equations true.

Please check that you copied the problem correctly.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

Ok

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Hi;

Or you can give me the link where the problem is posted.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

That no link that assignment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,663

Then just say the answer is the null set.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 333

ok thanks

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