Chapter 2.1, Problem 4QCE

Let $s=f\left(t\right)$ be the equation of a position versus time curve for a particle in rectilinear motion, where $s$ is in meters and $t$ is in seconds. Assume that $s=-1$ when $t=2$ and that the instantaneous velocity of the particle at this instant is $3\text{ m/s}$ . The equation of the tangent line to the position versus time curve at time $t=2$ is $\text{\_\_\_\_\_\_}$ .