
Systems of Linear Equations
Real World Systems and Solutions

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


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


At how many mnutes do both companies charge the same amount?
Never, the slope of the graphs of their rates is the same. Parallel lines never intersect.

A Real World Dilemna!
Use your knowledge of solutions of systems of linear equations to solve a real world problem you might have already been faced with: Choosing the best cell phone plan

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