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)