75.27 Chapter 3 (Systems of differential equations). Section 20. The method of elimination. Exercises page 212

75.27.1 problem 776
75.27.2 problem 777
75.27.3 problem 778
75.27.4 problem 779
75.27.5 problem 780
75.27.6 problem 781
75.27.7 problem 782
75.27.8 problem 783
75.27.9 problem 784
75.27.10 problem 785
75.27.11 problem 786