19 Chapter 9.1, The Phase Plane: Linear Systems. page 505

  19.1 problem 1
  19.2 problem 2
  19.3 problem 3
  19.4 problem 4
  19.5 problem 5
  19.6 problem 6
  19.7 problem 7
  19.8 problem 8
  19.9 problem 9
  19.10 problem 10
  19.11 problem 11
  19.12 problem 12
  19.13 problem 13
  19.14 problem 14
  19.15 problem 15