# Thread: How do i reduce this matrix to echelon form?

1. ## How do i reduce this matrix to echelon form?

How do i reduce this matrix to echelon form?

Thanks

How do i reduce this matrix to echelon form?

Thanks
Do row operations. What have you tried? Where are you stuck?

3. Originally Posted by mr fantastic
Do row operations. What have you tried? Where are you stuck?
I thought one of the rows had to start with one and make this the top one, but none of them don't?

I thought one of the rows had to start with one and make this the top one, but none of them don't?
Are you familiar with the three basic row operations? If so, I don't see what the trouble is.

5. Originally Posted by mr fantastic
Are you familiar with the three basic row operations? If so, I don't see what the trouble is.
can you divide the top one by 4?

6. Yes, multiplying (or dividing) each number in a row by a fixed number (not dividing by 0, of course) is a row operation.

7. Originally Posted by HallsofIvy
Yes, multiplying (or dividing) each number in a row by a fixed number (not dividing by 0, of course) is a row operation.
ok so its

1 0 1/4
2 3 -3
2 -1 4
0 1 2

becomes

1 0 1/4
0 3 -7/2
0 -1 7/2
0 1 3/2

ok so its

1 0 1/4
2 3 -3
2 -1 4
0 1 2

becomes

1 0 1/4
0 3 -7/2
0 -1 7/2
0 1 3/2

Assuming all calculations are correct, it is not quite finished.

I suggest you will benefit by going to your class notes or textbook and reviewing this material more thoroughly.

9. Well, the first row does start with 1. Now, do the same thing, starting with the second row- you can treat it as if it were a 2 by 3 matrix now.

10. Originally Posted by mr fantastic
Assuming all calculations are correct, it is not quite finished.

I suggest you will benefit by going to your class notes or textbook and reviewing this material more thoroughly.
My notes are rubbish

How do i do it, can you tell me please.

My notes are rubbish

How do i do it, can you tell me please.
R4 --> R4 + R3 should be obvious.

As for your notes, that's a reason why educational institutes build libraries ....

12. Originally Posted by mr fantastic
R4 --> R4 + R3 should be obvious.

As for your notes, that's a reason why educational institutes build libraries ....
So :

1 0 1/4
0 3 -7/2
0 -1 7/2
0 0 5

Is that complete now?