graph problem

Question

Let x represent the number. Use the given conditions to write an equation. Solve the equation and find the number.

The graph shows the number of people in Country A without health insurance from year 0 through year 3.



In year 0, there were 25 million people in Country A without health insurance. This number has increased at an average rate of 4.1 million people per year. In what year will the number of people in Country A without health insurance first reach 100 million?

year 21

year 18

year 20

year 19

Answer 1

y represents the number of years

x = 25 + 4.1y       (in millions)