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09-05-2007, 09:34 PM | #1 |
der Zeck
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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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09-05-2007, 11:37 PM | #2 |
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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09-05-2007, 11:58 PM | #3 |
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Zing - right over my head!
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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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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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09-06-2007, 12:47 AM | #6 |
same amount of posts lol
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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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09-06-2007, 12:48 AM | #7 |
Engineer/Artist/House-Dad
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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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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"... --B
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09-06-2007, 10:48 AM | #9 | |
der Zeck
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Quote:
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09-06-2007, 10:51 AM | #10 | |
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Quote:
dude i can do that in 2 min.....haha yea right!
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09-06-2007, 10:57 AM | #11 | |
Shiny Chromey Coolness
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Quote:
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Bringin the Bling to Yarisworld |
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09-06-2007, 11:09 AM | #12 |
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09-06-2007, 11:55 AM | #13 |
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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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09-06-2007, 12:30 PM | #14 |
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42
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09-06-2007, 02:37 PM | #15 |
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static808 is the real deal!
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09-06-2007, 10:41 PM | #16 |
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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09-06-2007, 10:55 PM | #17 |
der Zeck
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I took calc as well, but never learned this
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09-07-2007, 01:02 AM | #18 |
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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