Population decreases at the rate of 25 people every 5 years
slope of a line = difference in y / difference in x (or rise / 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 which answer choice has slope = -5 and y-intercept =250?
OR IF THAT WAS HARD TO UNDERSTAND
The initial population is 250
It decreases at a rate of 5 people per year
After year one, it will be 250 - 1(5)
After year two, it will be 250 - 2(5)
After year three, it will be 250 - 3(5)
After year x, it will be 250 - x(5)
The function is y = -5x + 250