At how many minutes do both companies charge the same amount?
When is Company T a better Value?
T is a better value from 0 to 20 minutes.
When is Company S a better Value?
S is a better value if you talk more than 20 minutes
The pink region represents the cheaper segment of the chart.
Real World Horror story
A well known real world math incident that almost cost a Verizon customer a large amount of money (Hint: there's a difference between .02 cents and .02 dollars!)