Christopher is deciding between two different movie streaming sites to subscribe to. Plan A costs $31 per month plus $2 per movie watched. Plan B costs $11 per month
plus $3 per movie watched. Let A represent the monthly cost of Plan A if Christopher
watches x per month, and let B represent the monthly cost of Plan B if Christopher
watches x movies per month. Write an equation for each situation, in terms of x, and
determine the interval of movies watched, x, for which Plan A is cheaper than Plan B.