77.21 Chapter IV. Equations of the first order but not of the first degree. Exercise IV (D) at page 57

77.21.1 problem 1
77.21.2 problem 2
77.21.3 problem 3
77.21.4 problem 4
77.21.5 problem 5
77.21.6 problem 6
77.21.7 problem 7
77.21.8 problem 8
77.21.9 problem 9
77.21.10 problem 10