The conclusion drawn from the results of this research are as follows: (1) The
results prove that the Adams-Moulton method is more rigorous than the
Runge-Kutta Fehlberg method in solving first and second order linear ordinary
differential equations. (2) Results of this research support the results of relevant
research that the Adams-Moulton method gives better accuracy than Runge-Kutta
Fehlberg method. (3) Double-step method has better accuracy than the one-step
adaptive step size method to solve first and second linear ordinary differential
equations because the average relative error in Rungge-Kutta Fehlberg method is
greater than the average relative error of the Adams-Moulton method.
There are some suggestions for further study, which are: (1) Future
experiments can be done by increasing the ordinary differential equation to
higher-order and by using more complex functions, such as trigonometric and
logarithmic functions. (2) Evaluation on the process of iteration and time of each
method still need to be taken into account. It is also needed to experiment with
using the different algorithm method of Runge-Kutta Fehlberg in determining the
step size. (3) Convergence values of the differential equations need to be taken
into account before the study is conducted.