SOLUTION: Solving a system of four equations: 3a+2b+c-d=-5 2a-5b+8c+2d=19 7a+12b-3c=-5 11a-7b=18

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Solving a system of four equations: 3a+2b+c-d=-5 2a-5b+8c+2d=19 7a+12b-3c=-5 11a-7b=18      Log On


   

Question 183507: Solving a system of four equations:
3a+2b+c-d=-5
2a-5b+8c+2d=19
7a+12b-3c=-5
11a-7b=18
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
This site shows how to do, and it solves it for you.
http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi?c=sys
--------------------------
This works well, gives the answers so you can check your work. You can write a computer program to do these (I did it years ago in Fortran), but I would use Excel and determinants to do it now. I have an Excel sheet that does up to 4th order.