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