A cell phone provider offers a plan that costs $40 per month plus $0.20 per text message sent or received. A comparable plan costs $60 per month but offers unlimited text messaging. a. Set up a system of equations that represents this situation.

b. Graph your equations on a coordinate grid.

c. Using your graph, determine how many text messages you would have to send or receive in order for the plans to cost the same each month. Explain how you know this.

d. Using your graph, if you send or receive an average of 50 text messages each month, which plan would you choose? Explain why.