70.23 Chapter 6. Systems of First Order Linear Equations. Section 6.1 (Definitions and examples). Problems at page 388

70.23.1 problem 2
70.23.2 problem 3
70.23.3 problem 4
70.23.4 problem 5
70.23.5 problem 6
70.23.6 problem 7
70.23.7 problem 8
70.23.8 problem 9