linear algebra help... please see attachment

Question

chrisplusian · Answer

attachment

chrisplusian · Answer

I need help with 8 and 9, I really don't know what to do on these problems

mathmate · Answer

Not strong enough to do hand stand to read the paper!  lol

chrisplusian · Answer

wow sorry when I originally viewed it it was not upside down give me just one second lol...

chrisplusian · Answer

I cant figure out why it keeps posting upside down

chrisplusian · Answer

It is right side up the way I have it saved

chrisplusian · Answer

attachment

mathmate · Answer

Here's a link. http://linear.ups.edu/jsmath/latest/fcla-jsmath-latestli18.html If you study example SAA, you will see how the solution vectors were obtained from the RREF. You will have to do the reverse, namely reconstruct the RREF from the row vectors. I have to go now. Someone else may be able to help you. If not, I'll continue tomorrow. Try @dan815 if he is available.

chrisplusian · Answer

I actually have to sign off now too, but will be back on tomorrow afternoon so if you are able to take a look at it again I would appreciate it

chrisplusian · Answer

@mathmate I read the example but for me it didn't really help. I already understood that. I know how to go that direction. My problem is understanding how to go the other way

mathmate · Answer

@chrisplusian
I will not be available this afternoon, but later in the evening, I will be on.
We can look at it if you have not yet figured it out by then.