7.7 Section 2.2, linear equations with constant coefficients. Page 138

7.7.1 problem 1
7.7.2 problem 2
7.7.3 problem 3
7.7.4 problem 4
7.7.5 problem 5
7.7.6 problem 6
7.7.7 problem 7
7.7.8 problem 8
7.7.9 problem 9
7.7.10 problem 10
7.7.11 problem 11
7.7.12 problem 12