## Calculus (3rd Edition)

Since $t=\frac{x-2}{4}$, substituting $t$ into $y$ gives $y=3+\frac{2 (x-2)}{4}=3+\frac{x-2}{2}=2+\frac{x}{2}$. This is the equation of a line. As $x$ moves to the right, $y$ is increasing. The direction of motion is going up. There is only one direction of motion.