Finite Math Help

[landrym28]

I remember doing stuff like this in first year University math. I remember doing it, I just couldn't remember how to do it - since that was probably 7 years ago.

[Black Yaris]

how about Solving a system of equations by using the inverse of the coefficient matrix.... I am soooo lost I do not understand the gauss-jordan method at all

[blueskana]

Way to come thru for a brother static808. Nice.

[static808]

Originally Posted by Black Yaris

how about Solving a system of equations by using the inverse of the coefficient matrix.... I am soooo lost I do not understand the gauss-jordan method at all

solving a system using inverse matrices is very effective, especially if you are very adept at finding determinants AND gaussian elimination is something that you just cant seem to master. however, for systems beyond 3x3, there is no formula for finding inverse matrices, meaning you'll have to use gaussian elimination to actually FIND the inverse matrix. meaning you are once again using a method you were trying to AVOID. if you are sure that your test will only have systems of 3x3 or smaller, then the inverse matrix method of solving systems will be very effective (i know, since i primarily used that method as well!). good luck!

--B

[Black Yaris]

It looks as if all of our problems will be no larger than a 3x3..... I just skipped all the inverse matrices problems on my homework, I hate our text all it shows is the problem and the answer, and it says use row funtions to get the answer, but it does not show you step by step... and everyone is lost in this class

[static808]

Originally Posted by Black Yaris

It looks as if all of our problems will be no larger than a 3x3.....

then by all means use the inverse matrix method! the only snag with this method is that sometimes you can get nasty fractions, but i'd still rather deal with that than gaussian elimination, where mistakes are more easily made. if you need more help, i can try, but this might be difficult to explain over the internet, seeing as how some of my previous students had a hard time learning this with me right beside them! again, good luck!!

--B

[sam07yaris]

row echelon form

aren't you supposed to make the -2 to a positive

[sam07yaris]

its easy, just let me re teach myself the row echelon form

[cm07yaris]

i <3 math