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math question

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three60mute
Posts: 470 - Karma: 10
okay, i need to know how to solve this augmented matrix
i copied it off a test and fortunately i can finish it tommorow so any help would be greatly appreciated.

1 1 -2 4
2 1 2 0
1 -3 -4 -2
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First one on the lift, last one off.
Nov 30 2004 6:30PM
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thefart
Posts: 281 - Karma: 10
5
Nov 30 2004 6:30PM
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R-Bertsch
Posts: 4719 - Karma: 20
shit i did these for my math class a month or two ago, you in algebra 2?
Nov 30 2004 6:32PM
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three60mute
Posts: 470 - Karma: 10
ya i'm in algebra 2

if it's not too much to ask could i get all the steps too?
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First one on the lift, last one off.
Nov 30 2004 6:33PM
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three60mute
Posts: 470 - Karma: 10
and it's not 5 cuz there's 3 answers
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Nov 30 2004 6:33PM
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R-Bertsch
Posts: 4719 - Karma: 20
well i could do it but that would be a shit load of work. use cramers theory!


Nov 30 2004 6:34PM
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Jenna1106
Posts: 3012 - Karma: 10
i took algebra two last year and ithough matrix's were mad easy but i don't remember learning that. can't you just plug it into a calculator?
Nov 30 2004 6:35PM
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R-Bertsch
Posts: 4719 - Karma: 20
ohhh you just need to know HOW to solve it
i cant tell you that wait like 5 minutes and ill explain the method
Nov 30 2004 6:37PM
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three60mute
Posts: 470 - Karma: 10
you can't use cramer's rule on this

i just need to know the steps, there should be about 6-7
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First one on the lift, last one off.
Nov 30 2004 6:38PM
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R-Bertsch
Posts: 4719 - Karma: 20
god dammit i forget how to do them, i know you have to cover up the first row and the first column and that makes a small matrice, then youu cover up the first rown and second column and then first row and third column and make the 2x2 matrices out of the remaining numbers. Then you multiply the 3 2x2 matrices or some shit
Nov 30 2004 6:41PM
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faah
Posts: 1576 - Karma: 13
just make each line have a 1 and the answer by changing each line then adding or subtracting to the other... that didnt help at all
end:
1 0 0 answer for x
0 1 0 answer for y
0 0 1 answer for z

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Nov 30 2004 6:43PM
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lineskier10
Posts: 11339 - Karma: 796
yeah i did this sophmore year, but dont you have a graphing calc, because i know that can solve most problems with matrices
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Nov 30 2004 6:44PM
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Pklink04
Posts: 5608 - Karma: 392
isnt it
4
5
-3



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Nov 30 2004 6:45PM
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three60mute
Posts: 470 - Karma: 10
i've gotta show work, so the steps would come in extremely handy
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First one on the lift, last one off.
Nov 30 2004 7:02PM
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TeenageWasteland
Posts: 1237 - Karma: 10
try googling it, theres some math geniouses out there who could tell ya
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Nov 30 2004 8:09PM
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aggro_sk8
Posts: 2760 - Karma: 18
X

technically as a variable, its not wrong, hehehe

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Nov 30 2004 8:25PM
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skiinjected
Posts: 631 - Karma: 11
boys use the graphing calculator











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Nov 30 2004 9:29PM
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user098123
Posts: 6072 - Karma: 18
How exactly does the question go? i took algebra 2 freshmen year so i don't remember everything exactly but if there is anything else to the problem please post it...
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Nov 30 2004 9:37PM
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skiinjected
Posts: 631 - Karma: 11
your proably going to need to put it in the quad forumla











dont take life too seriously, you will never get out alive


Nov 30 2004 9:43PM
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user098123
Posts: 6072 - Karma: 18
I dunno if this helps at all, but i put it into an equation form so it would look like this:
x + y - 2z = 4
2x + y - 2z = 0
x - 3y - 4z = -2

Dunno if that helps, but like i said i haven't taken algebra 2 since freshmen year, 2 years ago.
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Nov 30 2004 9:50PM
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Jenna1106
Posts: 3012 - Karma: 10
i think thats how you do it...i remember learning that last year for sure.
Nov 30 2004 10:00PM
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rebel
Posts: 5198 - Karma: 22
Put the matrix in reduced echelon form. Then get back to me with what you have and I'll tell you how to solve it from there.

- - - - -
'It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart.' - Anne Frank
Nov 30 2004 10:31PM
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rebel
Posts: 5198 - Karma: 22
oh the things people do when they procrastinate:

1 1 -2 4
2 1 2 0
1 -3 -4 -2


1 1 -2 4
0 -1 6 -8
0 -4 -2 -6


1 0 4 -4
0 1 -6 8
0 0 1 13/11


1 0 0 -4-52/11
0 1 0 8+78/11
0 0 1 13/11

so x1 = -4 - 52/11
x2 = 8 + 78/11
x3 = 13/11

It's very possible that I made some adding errors. I think it's right though.

- - - - -
'It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart.' - Anne Frank
Dec 1 2004 1:02AM
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marita04
Posts: 788 - Karma: 8
^nice job
Dec 1 2004 11:03AM
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beep
Posts: 318 - Karma: 9
A for you.
Dec 1 2004 1:32PM
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*Neil
Posts: 2591 - Karma: 75
That shit is mad easy.. just use the pivot method.. Is that how u guyz lernt to do these questions? cuz pivoting is so easy to solve them
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Dec 1 2004 1:39PM
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Pavesi
Posts: 628 - Karma: 10
give that man a cocnut
Dec 1 2004 1:40PM
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t-roy
Posts: 4041 - Karma: 52
^cocnut eh?
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Dec 1 2004 3:09PM
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t-roy
Posts: 4041 - Karma: 52
i'll give you a cocnut...actually no i won't
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http://www.surveysavvy.com/?id=1645797

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your friends and make more!*

Dec 1 2004 3:09PM
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rebel
Posts: 5198 - Karma: 22
I like coconut. Oh wait, no I don't.

- - - - -
'It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart.' - Anne Frank
Dec 1 2004 4:13PM
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Pavesi
Posts: 628 - Karma: 10
then no cocnut for u
Dec 1 2004 4:16PM
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rebel
Posts: 5198 - Karma: 22
oh, hey jackass! You're welcome.

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'It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart.' - Anne Frank
Dec 3 2004 12:19PM
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*i<3snow*
Posts: 6440 - Karma: 41
im in alg2/trig, but i didnt learn that yet. but i wouldnt suggest asking newschoolers people for help on ur math test. ns isnt exactly the smartest bunch...

www.hotmath.com works every time.






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Dec 3 2004 1:43PM
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rebel
Posts: 5198 - Karma: 22
Bite me. I'm smart and I'll kill anyone who says otherwise.

- - - - -
'It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart.' - Anne Frank
Dec 3 2004 2:18PM
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rightcoastskier
Posts: 2440 - Karma: 10
ude just put that shit in the graphing calc and ur set
ok
Dec 3 2004 2:26PM
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bigdoubler125805y
Posts: 1236 - Karma: -8
just enter them into the matrices (2nd x-1)
and then have the calc do it


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There's nothing to lose when noone knows your name.
Dec 3 2004 5:56PM
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evilninja
Posts: 1069 - Karma: 10
im in ALG2 also, but my teacher skipped all that matrices shit because she said it was too hard.

-Baybe, I ain't no hero.I'm just a

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Dec 3 2004 6:16PM
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guddgulf17
Posts: 3037 - Karma: 10
we had our test on matracies today, and i have nerver heard of that. i am in math three
depending on my mood, you might get a nice thoughtful responce that might make sense, or you might get complete jibberish that is not wise to even read. good luck



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Dec 3 2004 10:47PM
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SSteezle
Posts: 9300 - Karma: 7,702
take the last 2 rows put them next to the other 3, then just use cramer's rule, go down acros one way then the other way.......
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