78.6 Chapter 2. First order equations. Section 10 (Linear equations). Problems at page 82

78.6.1 problem 2 (a)
78.6.2 problem 2 (b)
78.6.3 problem 2 (c)
78.6.4 problem 2 (d)
78.6.5 problem 2 (e)
78.6.6 problem 2 (f)
78.6.7 problem 2 (g)
78.6.8 problem 2 (h)
78.6.9 problem 2 (i)
78.6.10 problem 2 (j)
78.6.11 problem 3 (a)
78.6.12 problem 3 (b)
78.6.13 problem 3 (c)
78.6.14 problem 4 (a)
78.6.15 problem 4 (b)
78.6.16 problem 4 (c)
78.6.17 problem 7
78.6.18 problem 8