It is given in the question that
A city had population 67,255 on January 1,2000, and its population has been increasing by 2935 people each year since then.
Here initial population , b, is 67255, and the rate of increase of population is 2935 people each year. And that's the value of the slope .
Using slope intercept form, which is
[tex]y=mx+b[/tex]
And substituting the values of m and b, we will get
[tex]p(t)=2935t +67255[/tex]