The cost of renting movies from an online video store is represented by the equation y = 2x+ 4 where x represents the number of months you rent movies. How many movies did you rent if the cost was $12?

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?