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 one year ago
Basis for the column space of A problem:
For #3(a) [ http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf ], how did the solution go from U to R? when c != 3
 one year ago
Basis for the column space of A problem: For #3(a) [ http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf ], how did the solution go from U to R? when c != 3

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s3a
 one year ago
Best ResponseYou've already chosen the best response.0It seems c was chosen to be 4 but why?

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1divide the second row by (c3)

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1subtract row2 from row1

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1c was not chosen to be 4

s3a
 one year ago
Best ResponseYou've already chosen the best response.0I get this: http://i.imgur.com/RIZgXlJ.jpg

s3a
 one year ago
Best ResponseYou've already chosen the best response.0Wait, I think we're miscommunicating. I meant that as in I did what you said and there are still "c"s floating around.

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1well subtract (4/(c3))(row3) from row2 and subtract (2+4/(c3))(row3) from row1

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1i think you should look again row reduced echelon form

s3a
 one year ago
Best ResponseYou've already chosen the best response.0but wouldn't that have the position which currently has the leading ones' with "c"s?

s3a
 one year ago
Best ResponseYou've already chosen the best response.0Also, sorry for being slow right now, my brain is being overworked and I can't take a break because I have exams.

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1look at the picture you uploaded

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1to get the row reduced echelon form, you will make everything zero above pivots right?

s3a
 one year ago
Best ResponseYou've already chosen the best response.0Yes, I see it. :D Let me just confirm, I get the same answer.

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1well since row3 is 1 1 it will remove same things above ok i see you got it

s3a
 one year ago
Best ResponseYou've already chosen the best response.0I've confirmed that I got it. :D Thanks a lot.

s3a
 one year ago
Best ResponseYou've already chosen the best response.0"row 3 is 1 1" is what made me see it instantly.

ingenuus
 one year ago
Best ResponseYou've already chosen the best response.1good luck on your exam! :)

s3a
 one year ago
Best ResponseYou've already chosen the best response.0(Also, good luck on yours if you have any.)

s3a
 one year ago
Best ResponseYou've already chosen the best response.0Actually, I have another question. Why does it matter what c is equal to if it dissapears thanks to elimination? (Sorry if that's a dumb question.)
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