#title 연립방정식
[[TableOfContents]]

==== 예제 ====
{{{
> x<-c(1,2,1,1,-1,-2,1,-1,2,3,1,4,-1,-3,0,3)
> A<-matrix(x,ncol=4)
> A
     [,1] [,2] [,3] [,4]
[1,]    1   -1    2   -1
[2,]    2   -2    3   -3
[3,]    1    1    1    0
[4,]    1   -1    4    3
> b<-c(-8,-20,-2,4)
> solve(A,b)
[1] -7  3  2  2
> 
}}}