Question 901575
Identify ordered pair data points.  You want number of campers as the dependant variable, and time, or year
as the independant variable.


(2005, 450); five years later,  ROSE TO 750 campers, so the point is (2010, 750).
You want a linear equation representing this relationship.  Take your choice on how.


{{{m=(750-450)/(2010-2005)=300/5=60}}}.

Using the first ordered pair with point-slope form equation,
{{{y-450=60(x-2005)}}}
{{{y=60(x-2005)+450}}}
{{{y=60x-60*2005+450}}}
{{{highlight(y=60x-119850)}}}


Another way to handle this is to call year 2005 as time ZERO, and then your x would be number of
years since year 2005.  You would get a different y-intercept value.