83.2 Chapter II. Equations of first order and first degree. Exercise II (A) at page 8

83.2.1 problem 1
83.2.2 problem 2
83.2.3 problem 3
83.2.4 problem 4
83.2.5 problem 5
83.2.6 problem 6
83.2.7 problem 7
83.2.8 problem 8
83.2.9 problem 9
83.2.10 problem 12