Chapter 9.7, Problem 2AYU

Let $x=f\left(t\right)$ and $y=g\left(t\right),$ where f and g are two functions whose common domain is some interval l. The collection of points defined by $\left(x,y\right)=f\left(t\right),g\left(t\right)$ is called a (n) _____. The variable t is called a(n).