One smartphone plan costs $48 per month for talk and messaging and $8 per gigabyte of data used each month. A second smartphone plan costs $78 per month for talk and messaging and $3 per gigabyte of
data used each month. Let c represent the total cost in dollars and d represent the amount of data used
The system of equations
= 48 +8d
can be used to represent this situation.
C = 78 +3d
in gigabytes
How many gigabytes would have to be used for the plans to cost the same? What would that cost be?
C