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 ​$70 per month but offers unlimited text messaging. Complete parts a. and b. below.

Answer 1

a. Write an equation for the cost y (in dollars) of x text messages for the ​$40 per month plan.
y = 40 + 0.20x

b. Write an equation for the cost y (in dollars) of x text messages for the ​$70 per month plan.
y = 70