A =

   25   19
   21   16

Part a)

cond_inf_A =  2024

Part b)

x_exact =

   1.00000
  -1.00000

x_perturbed =

   1.3500
  -1.4600

relative_change_in_x =  0.46000
relative_change_in_b =  0.0016667
predicted_bound_on_relative_change_in_x =  3.3733

Part c)

x_exact =

  -3.0000
   4.0000

x_perturbed =

  -2.6500
   3.5400

relative_change_in_x =  0.11500
relative_change_in_b =  0.010000
predicted_bound_on_relative_change_in_x =  20.240