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

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

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

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

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

s3a
 2 years 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
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.1i think you should look again row reduced echelon form

s3a
 2 years 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
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.1look at the picture you uploaded

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

ingenuus
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0I've confirmed that I got it. :D Thanks a lot.

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

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

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

s3a
 2 years 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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