A recent survey indicated that residents of a small town take the train to a nearby city eight times per month, on average. The same survey showed that the number of train trips that a resident takes per month (y) is determined by the number of days per month that the resident works in the nearby city (x), according to the equation: y = 2 + 2x. A person who never works in the nearby city is expected to take the train:

Question

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If a person never works in the nearby city, x = 0. Substituting x = 0 into the equation y = 2 + 2x gives y = 2 + 2(0) = 2. Thus, the person is expected to take the train two times per month.

A Recent Survey Indicated That Residents of a Small Town