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.