Mathematics

Question

PLEASE HELP!.
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

2 Answer

  • Im pretty sure that the answer is D.
  • Answer:

    A (tested this and was Correct)

    beware there's a similar question but not the same  equations

    Step-by-step explanation:

    slope of a line = difference in y

    or

    difference in x (or rise over run) = -25 / 5  slope m = -5

    when x = 0 (that is the year 1970), the population is 250.

    x = 0 represents the y-intercept.

    so the answer choice could have the slope = -5 and y-intercept = 250

    which leads to A  y = –5x + 250

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