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It seems c was chosen to be 4 but why?

divide the second row by (c-3)

subtract row2 from row1

and so on..

c was not chosen to be 4

I get this: http://i.imgur.com/RIZgXlJ.jpg

with what you said

good :)

well subtract (-4/(c-3))(row3) from row2
and subtract (2+4/(c-3))(row3) from row1

i think you should look again row reduced echelon form

but wouldn't that have the position which currently has the leading ones' with "c"s?

no it won't

look at the picture you uploaded

row 3 is 1 1

OH!

to get the row reduced echelon form, you will make everything zero above pivots right?

Yes, I see it. :D Let me just confirm, I get the same answer.

well since row3 is 1 1
it will remove same things above
ok i see you got it

I've confirmed that I got it. :D
Thanks a lot.

!

"row 3 is 1 1" is what made me see it instantly.

(Just saying.)

good luck on your exam! :)

Thanks. :)

(Also, good luck on yours if you have any.)