20 Minutes

10 Minutes

Never, the slope of the graphs of their rates is the same. Parallel lines never intersect.

Step 1

At how many minutes do both companies charge the same amount?

20 minutes

Step 2

When is Company T a better Value?

T is a better value from 0 to 20 minutes.

Step 3

When is Company S a better Value?

S is a better value if you talk more than 20 minutes

Step 4

The pink region represents the cheaper segment of the chart.