Question 58990
The U.S.population has increased since 1970 from 223 million to 456 million.I need to show how this will show an increase over the years. 
------------
You have two points (1970,223 mil), (2006,456 mil)
you want an equation of the form "pop=(slope)(year)+intercept".
slope= [456 mil - 223 mil]/[2006-1970]=233 mil/36=6.4722222... mil
Intercept: 223 mil =(6.472222..mil)(1970)+intercept
223 mil = 12750.28 mil+ intercept
intercept = -12527.28 mil
------------
EQUATION:
Population = (6.4722...mil)(year) - 12527.28 mil
Cheers,
Stan H.