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

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) (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
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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.
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