(* Linear Algebra: Theory and Applications *)
(* Ward Cheney & David Kincaid *)
(* JBPub.com (c) 2008 *)
(* File: ex1111.mat *)
(* Example 1.1.11     *)
(*                    *)
A = {{3.215793,82.13459},{9.300567,-1.776321}}
b = {5.332873,-12.99334}
x = LinearSolve(A,b)
r = A.x - b