octave: X11 DISPLAY environment variable not set
octave: disabling GUI features
error: writing file '/.octave_hist': Read-only file system
error: ignoring const octave::execution_exception& while preparing to exit

b =

   4
   9
   2

A =

   3   4   5
   1   3   1
   3   5   9

x =

  -1.5000
   4.0000
  -1.5000

b =

   4
   9
   2

A =

   3   4   5
   1   3   1
   3   5   9

x =

  -1.5000
   4.0000
  -1.5000