A cell-phone plan charges customers a monthly fee, which includes [math]500[/math] minutes of talk time. After [math]500[/math] talk minutes, the customer is charged [math]\$0.10[/math] a minute. The total monthly charges, [math]y[/math], for any number of talk minutes, [math]x[/math], can be represented using the piecewise function [math]y = \begin{cases}50, & \mbox {if 0} \leq {x} \leq {500} \\ 50 + 0.10x, & \mbox {if } x > 500 \end{cases}[/math]. Create a graph to show the monthly charges for any number of talk minutes.
