Answer
$y=65t-643.5$ (miles)
Work Step by Step
Let y be the distance from Jones Beach.
y is a linear function of time (in hours, P.M.).
$y=mt+b$
where m, the slope, is the speed of the car.
We are given (9.9,0), and in part (a), we found $m=65.$
So, we find b by substituting $t_{1}=9.9,y_{1}=0, m=65:$
$0=65(9.9)+b$
$0=643.5+b\qquad/-643.5$
$b=-643.5$
Thus, at time t,
$y=65t-643.5$ (miles)
