MATLAB: Solve the system of equations

Question

Solve the system of equations

[1 2 0 0
4 3 -6 0
0 5 -1 9
0 0 7 7]
x= 1
   2
   0
   0

Answer 1

A=[1 2 0 0
4 3 -6 0
0 5 -1 9
0 0 7 7];
b=[1;2;0;0];

since

det(A)==0
 =
     0

the operator

\

can also be used

x=A\b
x =
   0.500000000000000
   0.250000000000000
   0.125000000000000
  -0.125000000000000

if you find this answer useful would you please be so kind to mark my answer as Accepted Answer?

To any other reader, please if you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>