The program shows the input unique output property of a function. As input numbers are chosen the points are plotted
on a graph to help identify the function. A password is necessary to see the plotted function and the rule followed by
the function machine; the teacher, at their discretion, can give the password to students. The password is the first two prime
numbers, followed the the function machine number squared. For example, the password for this machine is 231. The password
feature is included to prevent early capitulation by the student who may be used to using a checkbox to see the answer. To avoid
students learning the password direct them to material 498097.
