83.7 Chapter II. Equations of first order and first degree. Exercise II (F) at page 24

83.7.1 problem 1
83.7.2 problem 2 (a)
83.7.3 problem 2 (b)
83.7.4 problem 3
83.7.5 problem 4 (a)
83.7.6 problem 4 (b)
83.7.7 problem 5 (a)
83.7.8 problem 5 (b)