83.5 Chapter II. Equations of first order and first degree. Exercise II (D) at page 16

83.5.1 problem 1
83.5.2 problem 2
83.5.3 problem 3
83.5.4 problem 4
83.5.5 problem 5
83.5.6 problem 6
83.5.7 problem 7
83.5.8 problem 8
83.5.9 problem 9
83.5.10 problem 10
83.5.11 problem 11
83.5.12 problem 12
83.5.13 problem 13
83.5.14 problem 14
83.5.15 problem 15
83.5.16 problem 16
83.5.17 problem 17
83.5.18 problem 18
83.5.19 problem 19
83.5.20 problem 20
83.5.21 problem 21