Task Three cell phone plans, A, B, and C, cach have a different flat monthly rate for the first 500 text
messages and a different constant rate for every additional message over 500.
These tables show the monthly charges for plans A and B when different numbers of messages
are sent
Plan A Cell Phone Charges
Number of Messages Total Monthly Charge
500
580
$66.00
$50.00
Plan B Cell Phone Charges
Number of Messages Total Monthly Charge
500
$45.00
580
$69.00
1
Scientific Calculator Graphing Calculator
Part A
Letting x represent the number of messages over 500, and y the total monthly charges, write
equations representing the charges for plans A and B. Then graph the equations for plans A and
B on the same coordinate grid.