7 Chapter 2. Linear equations with constant coefficients. Page 74

  7.1 problem 4(a)
  7.2 problem 4(b)
  7.3 problem 4(c)
  7.4 problem 4(d)
  7.5 problem 4(f)
  7.6 problem 4(g)
  7.7 problem 4(h)
  7.8 problem 4(i)