Let the number of years after 2001 be x, then
1280000 + 19500x = 1700000
19500x = 1700000 - 1280000 = 420,000
x = 420000/19500 = 22 years.
x = 22 years.
This can be solved by finding their point of intersection on the graph, which is at point (1,3).
-1/3. Use the formula x1-x2/y1-y2
