anonymous
  • anonymous
solve the system of equation using elementary row operations please x1 +x3+x4-2x5=1 2x1 + x2+ 3x3 -x4 +x5=0 3x1- x2 +x4 +4x3 +x4 +x5 =1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
[A|I] solve that
anonymous
  • anonymous
wait thats to find its inverse.
anonymous
  • anonymous
can i not do it without the inverse say.... 1 0 1 1 -2|1 0 0 0 -3 5|-2 0 0 2 -5 12| -4

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anonymous
  • anonymous
1 0 1 1 -2|1 0 1 1 -3 5|-2 0 0 2 -5 12| -4
anonymous
  • anonymous
|dw:1371475600469:dw|
anonymous
  • anonymous
what operation u did chris?
anonymous
  • anonymous
i just put it in a matrix.
anonymous
  • anonymous
now pivot on (1,1), (2,2) (3,3) i think
anonymous
  • anonymous
|dw:1371475725695:dw|
anonymous
  • anonymous
thats the originaql matrix
anonymous
  • anonymous
yep i did that
anonymous
  • anonymous
now i see u pivoted on (1,1) and (2,2)
anonymous
  • anonymous
try pivoting on (3,3)
anonymous
  • anonymous
do u mean row 1 column 1 by (1,)? and pivot? move
anonymous
  • anonymous
im confused
anonymous
  • anonymous
so pivot on 3rd row 3rd column where there is a 4 in the original matrix once u pivtoed on (1,1) and (2,2)
anonymous
  • anonymous
this is what i get |dw:1371475928708:dw| i just need to know how to solve please
dan815
  • dan815
okay this is what u gotta do
dan815
  • dan815
|dw:1371476055250:dw|
anonymous
  • anonymous
pivot on (3,3)
dan815
  • dan815
|dw:1371476095401:dw|
anonymous
  • anonymous
oh i see dan 815, thats guassiaon
dan815
  • dan815
r3-2r2 and then r3-5*3/2 r2
anonymous
  • anonymous
so u get|dw:1371476137989:dw|
anonymous
  • anonymous
now we let x5=t x4=s
anonymous
  • anonymous
thats what i mean by pivot (3,3) make (3,3) a 1 entry
anonymous
  • anonymous
yes i got the above matrix thanks im getting it now
anonymous
  • anonymous
sweet
anonymous
  • anonymous
then write (x1,x2,x3,x4,x5) in terms of s and t
anonymous
  • anonymous
thanks chris and dan
anonymous
  • anonymous
u have no idea wat u r doing dan
anonymous
  • anonymous
haha.
dan815
  • dan815
no no i do lol i know how to do matricies atleast xD
dan815
  • dan815
we learnt upto eigen values
anonymous
  • anonymous
haha. eigen values is LEGEND
anonymous
  • anonymous
but wait guys, i was doing wahat dan said 1st...smh chris what row operations u did?
anonymous
  • anonymous
for row 3 i first did 1/2 of row 3 to get (3,3) to 1
anonymous
  • anonymous
oh i see so all the rows 1st non zero should be 1 right?
anonymous
  • anonymous
dont know what ur trying to say
anonymous
  • anonymous
but we pivot from left to right.
anonymous
  • anonymous
down the matrix
anonymous
  • anonymous
that word "pivot" confuses me...just tell me wat u did for row 2 please, the operation
anonymous
  • anonymous
new row 2 = r2-r3 when we have 1 on (3,3)
anonymous
  • anonymous
so we form a 0 above the 1
anonymous
  • anonymous
now we need to peform a 0 in row 1
dan815
  • dan815
|dw:1371477202000:dw|
anonymous
  • anonymous
correct!
anonymous
  • anonymous
then u let x5=t x4=s
dan815
  • dan815
oh ok i see
anonymous
  • anonymous
obviously it won't be unique...
dan815
  • dan815
yes ofcourse lol
dan815
  • dan815
a quadratic solution
anonymous
  • anonymous
u said u had to make all these zero's i was like ;qieufhqierufhqrfqr
dan815
  • dan815
i learn now! OKAY!
anonymous
  • anonymous
grasshopper
dan815
  • dan815
i knew u cudnt make it all 000 but i was oping to just get get some unique 1s
dan815
  • dan815
and i thought that wud be enuff to write it as function of something
anonymous
  • anonymous
so th 3*3 part of the matrix should look like the identity matrix then? right?
dan815
  • dan815
yes
dan815
  • dan815
<---- matrix noob
dan815
  • dan815
i feel like watching matrix now
anonymous
  • anonymous
correct hahaha
anonymous
  • anonymous
loll ok thanks again..its just the concept i'm trying to grasp
anonymous
  • anonymous
yea it took me a while with what pivoting is...get to know what pivoting is. makes like simple
anonymous
  • anonymous
pivoting is like the whole principle of row reducing..
dan815
  • dan815
u can do this too
dan815
  • dan815
|dw:1371477640930:dw|
dan815
  • dan815
i call this operation the glass flip
anonymous
  • anonymous
i call it a waste of time.
dan815
  • dan815
hahaha
anonymous
  • anonymous
i call me playing u at fifa a waste of time
dan815
  • dan815
=O how dare u
anonymous
  • anonymous
haha
dan815
  • dan815
i will only use my goal keeper
anonymous
  • anonymous
wait do u have ps3?
dan815
  • dan815
i dont think so
dan815
  • dan815
no wait i do
anonymous
  • anonymous
how do u not know if u have one or not? LOL
dan815
  • dan815
lol i dunno its somehwere in the basement i didnt but it, its my bros
dan815
  • dan815
buy*
anonymous
  • anonymous
do u use it?
dan815
  • dan815
no i only play tic tac toe
dan815
  • dan815
iam very close to mastering it
anonymous
  • anonymous
nah if u have 2 people who know how to master it. always a draw
dan815
  • dan815
lol gee thankkss!!
anonymous
  • anonymous
|dw:1371477954369:dw|
dan815
  • dan815
|dw:1371477951236:dw|
dan815
  • dan815
GG
anonymous
  • anonymous
HAHAHAHAHAHAHAHAAHAHA
dan815
  • dan815
hahahahaha
anonymous
  • anonymous
fark that was funny
dan815
  • dan815
always pick x first thats the trick
anonymous
  • anonymous
|dw:1371478023209:dw|
anonymous
  • anonymous
wat now *****
dan815
  • dan815
lol no
dan815
  • dan815
ya but sseriously, i used to play ps3, xbod nintendo gamecube stuff.. but i dunno kinda grew out of it
dan815
  • dan815
then i played a lotta computer games.. stopped that too
dan815
  • dan815
now i just play random board games, to entertain kids when they come over
anonymous
  • anonymous
chess?
dan815
  • dan815
usually like monopoly, checks or chess too sometimes
anonymous
  • anonymous
i boss at chess
anonymous
  • anonymous
even though i don't look like the guy who would
dan815
  • dan815
r u really
dan815
  • dan815
i wanna learn to get better, but i dunnnoo
anonymous
  • anonymous
yea, its fun if u have a challenging opponent
dan815
  • dan815
have you seen that movie beautiful mind
dan815
  • dan815
thers this game they play with round stones and this table
anonymous
  • anonymous
russel crowe?
dan815
  • dan815
ya
anonymous
  • anonymous
good movie that
dan815
  • dan815
|dw:1371478259298:dw|
dan815
  • dan815
looks like that!! its a fun game
anonymous
  • anonymous
yea, never played it
dan815
  • dan815
these are the 2 games i want to learn, chess and that but i dont know anyone good at them
anonymous
  • anonymous
sorry to ruin the fun
anonymous
  • anonymous
but i'm having difficulty solving... x3 = -2 +5/6 -6t?
anonymous
  • anonymous
x3=-2-6t+5s/2
anonymous
  • anonymous
where x5=t x4=s
anonymous
  • anonymous
x2=t+s/2 x1=3+8t-7s/2
anonymous
  • anonymous
(x1,x2,x3,x4,x5)=s(-7/2,1/2,5/2,1,0)+t(8,1,-6,0,1)
anonymous
  • anonymous
i'll leave u at that i gtg to bed now now cya guys!
anonymous
  • anonymous
thanks much

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