Answer
p(x)=-0.25x+22
Work Step by Step
Slope is another word for rate of change. The given rate of change is decreasing at 0.25% per year. Therefore, m=-0.25. The graph starts at 1950, so this would be zero on the x-axis. Since the percentage was 22% in 1950, 22 is the y-intercept, or b.
y=mx+b
p(x)=-0.25x+22
