In 1990, y = 0 (no years have passed since 1990, of course)
This point can be described as (123000, 0).
In 2003, y = 13. The point is (197500, 13)
Now we just need to find the equation of a line between those two points.
We already know the y-intercept, that's 123000.
Calculate the slope...[tex]m=\frac{y_2-y_1}{x_2-x_1}=\frac{197500-123000}{13-0}=\frac{74500}{13}(simplified)[/tex]
Now, just write out your equation in slope-intercept form.
