This is a graph of the equation A(t) = a(1 - r)^t. In this case, we'll diagram t on the x-axis and A(t) on the y axis. 1. Set r to 1. Change the value of a. How does the graph change as a gets larger? As a is negative? 2. Set a to 1. Change the value of r. How does the graph change as r gets larger?