# Re: you are kidding, aren't you

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Posted by jemma franklin on September 23, 2002 at 11:59:44:

In Reply to: you are kidding, aren't you posted by T.Gracken on September 22, 2002 at 17:52:44:

: : Hi guys. Ive been able to answer these type with less variables but these have me stumped. They are supposed to be answered using augmented matrix in row reduced echelon form. Any help would be great!!..

: : x + 2x + 3x + 5x - 3x = 34
: : 5x + x + 5x + 7x + x = 21
: : 7x - 3x + x - 2x + 2x = 33
: : x + 5x - 2x - 14x - 4x = 11

: : and

: : x + 2x + 3x + 5x - 3x = 34
: : 5x + x + 5x + 7x + x = 21
: : 7x - 3x + x - 2x + 2x = 33
: : x - 6x - 7x - 14x + 4x = -20

: every variable is x? you better recheck the problem. and if there happen to be subscripts, then follow the same procedure that you would if there were fewer variables. you know, the procedure you said you understood if there were fewer variables

Well actually that is how it is written, but i probably wasnt to clear about the goal here.
What is supposed to happen is basically just convert the previous equation into matrix form and then use row reduction to solve. So the starting pattern is like this:

| 1 2 3 5 -3 34 |
| 5 1 5 7 1 21 |
| 7 -3 1 -2 2 33 |
| 1 -6 -7 -14 4 -20 |

and then row reduce, producing a pattern
something like this:
| 1 0 0 0 0 ? |
| 0 1 0 0 0 ? |
| 0 0 1 0 0 ? |
| 0 0 0 1 0 ? |

and the answer should be in the last column.
Thanks..

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