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Old 09-05-2007, 09:34 PM   #1
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Finite Math Help

Anyone familiar with the Echelon or GAUSS-JORDAN method of solving a linear system? My textbook sux, poor examples, and my professor's computer is down and she is using the library computer and I do not have a chance to comunicate with her tonight
4x- y+3z=-2
3x+5y- z=15
-2x+y+ 4z=14

there is the first problem... I am stumped.....
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Old 09-05-2007, 11:37 PM   #2
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you can check this website http://aspire.cs.uah.edu/textbook/gauss.html

i made it into college calculus but that was 5+ years ago and i have completely forgoten it all. man i gotta hit the textbooks again and sharpen up!

good luck man.
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Old 09-05-2007, 11:58 PM   #3
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Zing - right over my head!
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Old 09-06-2007, 12:09 AM   #4
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I tried for all of five minutes to figure it out, but it has been a looooong time. Sorry buddy. Don't you have to subtract entire equations from one another? Or solve for one variable and go from there? Something like that.
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Old 09-06-2007, 12:11 AM   #5
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I think Apples have graphical calculators that might be able to digest that stuff...
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Old 09-06-2007, 12:47 AM   #6
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if u have a ti-83 graphing calculator i believe it'll solve it for you if you put it in the matrices
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Old 09-06-2007, 12:48 AM   #7
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alright, if you wanna actually know the steps that i took, here goes:
1) multiply row 1 by 3, row 2 by -4 and row 3 by 6.
2) row 1 + row 2 = new row 2
3) row 1 + row 3 = new row 3
4) multiply row 1 by -23, row 2 by 3, row 3 by 23.
5) row 1 + row 2 = new row 1
6) row 2 + row 3 = new row 3
7) your 3rd row should now look like: 798z = 1596, OR z = 2.
8) solve backwards from there.

repeat this logic for every problem, and you should be peachy keen. i miss this stuff... but i'll gladly give it up to change diapers and raise my kids right...

--B
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Last edited by static808; 09-06-2007 at 01:07 AM.
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Old 09-06-2007, 01:08 AM   #8
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or you can simply use this page:

http://mkaz.com/math/js_lalg3.html

but be forewarned, you still have to learn how to do it. just use the webpage for homework "help"...

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Old 09-06-2007, 10:48 AM   #9
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Quote:
Originally Posted by static808 View Post
alright, if you wanna actually know the steps that i took, here goes:
1) multiply row 1 by 3, row 2 by -4 and row 3 by 6.
2) row 1 + row 2 = new row 2
3) row 1 + row 3 = new row 3
4) multiply row 1 by -23, row 2 by 3, row 3 by 23.
5) row 1 + row 2 = new row 1
6) row 2 + row 3 = new row 3
7) your 3rd row should now look like: 798z = 1596, OR z = 2.
8) solve backwards from there.

repeat this logic for every problem, and you should be peachy keen. i miss this stuff... but i'll gladly give it up to change diapers and raise my kids right...

--B
life saver that sample should be in our book
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Old 09-06-2007, 10:51 AM   #10
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Quote:
Originally Posted by static808 View Post
alright, if you wanna actually know the steps that i took, here goes:
1) multiply row 1 by 3, row 2 by -4 and row 3 by 6.
2) row 1 + row 2 = new row 2
3) row 1 + row 3 = new row 3
4) multiply row 1 by -23, row 2 by 3, row 3 by 23.
5) row 1 + row 2 = new row 1
6) row 2 + row 3 = new row 3
7) your 3rd row should now look like: 798z = 1596, OR z = 2.
8) solve backwards from there.

repeat this logic for every problem, and you should be peachy keen. i miss this stuff... but i'll gladly give it up to change diapers and raise my kids right...

--B

dude i can do that in 2 min.....haha yea right!
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Old 09-06-2007, 10:57 AM   #11
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Quote:
Originally Posted by Black Yaris View Post
Anyone familiar with the Echelon or GAUSS-JORDAN method of solving a linear system? My textbook sux, poor examples, and my professor's computer is down and she is using the library computer and I do not have a chance to comunicate with her tonight
4x- y+3z=-2
3x+5y- z=15
-2x+y+ 4z=14

there is the first problem... I am stumped.....
You can do math? Will wonders never cease.
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Old 09-06-2007, 11:09 AM   #12
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Originally Posted by redyaris View Post
You can do math? Will wonders never cease.
Damn man.
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Old 09-06-2007, 11:55 AM   #13
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Originally Posted by Black Yaris View Post
life saver that sample should be in our book
dude, anytime buddy. remember, at the very beginning you can also switch around the equations (1st with the 3rd, 2nd with the 1st, etc...) without affecting the results. why do this?? to get smaller common multiples, so your numbers arent so huge at the end... good luck!

--B
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Old 09-06-2007, 12:30 PM   #14
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Old 09-06-2007, 02:37 PM   #15
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static808 is the real deal!
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Old 09-06-2007, 10:41 PM   #16
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wow.. i am just starting to remember this....... I took AP Calc in high school but uhh i don't want to remember this...
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Old 09-06-2007, 10:55 PM   #17
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I took calc as well, but never learned this
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Old 09-07-2007, 01:02 AM   #18
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well we only did like a lil bit of it. i had a teacher who was like... in love with math...
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