% Linear Algebra: Theory and Applications
% Ward Cheney & David Kincaid
% JBPub.com (c) 2008 
% File: exp1111.m
% Example 1.1.11

format long
A = [3.215793,82.13459;9.300567,-1.776321]
b = [5.332873;-12.99334]
x = A\b 
r = A*x - b