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I thought to multiply the first row with 1/3...|dw:1329578934017:dw|

that would be a good idea angela :D

i can make the first element in the second row 0 but i can't go further :(

what's r? reduced row echelon?

idk wht u call it...i'm asking for the range

why? multiply the first row with -4 and add to the third row to get 0 under

colA is the range of a matrix A right?

row reduce to determine your pivot points; and all columns with a pivot point define colA

I'm sorry i don't get it..wht is colA???

as far as I can tell, thats the american version of range of a matrix

|dw:1329579146175:dw|

|dw:1329579294854:dw|

has made***

turning it into row reduced is extra work becasue the pivots dont change

i know the theory but i don't know how to use tht in practice -_-

how did u know u should have changed R1with R3???

Hmmmm.....ok thanks guys :):)

>> rank([3 6 9 3;2 -5 3 0;4 -10 10 4])
ans =
3

Matlab says it's 3 also so your teacher is tripping :D

I'm really hopeless...:(:(
thank you very much :) both of u :)

yes yes yes :)

ok here is one for begining:|dw:1329580248289:dw|

now tell me what is the first element of this matrix and is it different from zero?

since the first element f the matrix is 1 then the first element of R2 must be 0???

is the rank 1?? O.o

range***

add*

|dw:1329580611324:dw|

*Clicks on question thinking it's about the matrix*
DANGIT

number of rows*

so the range is 2???

haha :) can we work on some more examples pleaseeeee

of course....check this one:|dw:1329580900431:dw|

|dw:1329581058847:dw|

yes :D

|dw:1329581078055:dw|

no way :(:(|dw:1329581327917:dw|

great it's correct now what is the next pivot you see?

10????

that's my girl....now make zeros under that pivot....

xD just a thought...how abt R1-2R3???

tht won't work will it???

|dw:1329581919090:dw|

|dw:1329582143630:dw|

what is the third pivot now?

5???
but there's no 0 under it O.o

that's right....that means no more transformations with the matrix so what is the rank?

3??

yes

ur a genius xD :) Can i borrow ur brain???????

wait we must do one more :D

sure :)))

|dw:1329582383881:dw|

haha :D

how abt R1-2R3???

no problem :D OK Angela what is the first number you see?

|dw:1329582684252:dw|

OMG wait.... will i be the stupid girl who didn't get a single thing? :O:O:O

i was just going to ask if we could change C3 with C1 :)

|dw:1329582859078:dw|

now you work and I watch....:D

|dw:1329582907187:dw|

|dw:1329582876260:dw|

|dw:1329583007088:dw|

ahhhhaaaa...i just wanted ur confirmation ;) :P

|dw:1329583049393:dw|

|dw:1329583024634:dw|

|dw:1329583163929:dw|

|dw:1329583152017:dw|

|dw:1329583287374:dw|