Question

A small rural town has experienced a population decrease at a rate of 25 people every 5 years since 1970. If the population of the town in 1970 was 250, which of the following equations represents the town’s population as a function of time? (Assume 1970 is represented by x = 0, 1971 is represented by x = 1, and so on).
A.
y = –5x + 250
B.
y = –25x + 250
C.
–5x + y = 250
D.
–x – 25y = 250