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Gaussian Elimination

  • Thread starter Firepanda
  • Start date
  • #1
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I used Gaussian elimination on a matrix to find the soultions. I know that there is either no solutions or infinatley many, but the matrix is confusing me.

The only definition I have of when a matrix has infinatley many solutions is when a zero row is equal to zero, and no solutions when a zero row is equal to a real number.

But in this case is it infinatley many solutions or no solutions?

1 2 3 | 4

0 3 1 | 1

0 3 1 | 0

Where 3y + z = 1 and 0.

Thanks
 
Last edited:

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
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I used Gaussian elimination on a matrix to find the soultions. I know that there is either no solutions or infinatley many, but the matrix is confusing me.

The only definition I have of when a matrix has infinatley many solutions is when a zero row is equal to zero, and no solutions when a zero row is equal to a real number.
0 is a real number! You mean a non-zero number.

But in this case is it infinatley many solutions or no solutions?

1 2 3 | 4

0 -3 -1 | -1

0 -3 -1 | 0

Where -3y - z = -1 and 0.

Thanks
You haven't finished your Gaussian Elimination. Subtract the second row from the third.
 
  • #3
mjsd
Homework Helper
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your matrix is not in reduced-echelon form yet. do row 2 minus row 3 and see...
 
  • #4
430
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ah, so no solutions :P thanks
 

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