9 Chapter 2. Linear equations with constant coefficients. Page 83

9.1 problem 1(a)
9.2 problem 1(b)
9.3 problem 1(c)
9.4 problem 1(d)
9.5 problem 1(e)
9.6 problem 2
9.7 problem 3(a)
9.8 problem 3(b)
9.9 problem 5(b)