C4.1

recognize a scalar equation for a line in two-space to be an equation of the form $Ax+By+C=0$, represent a line in two-space using a vector equation (i.e., $\vec{r}={\vec{r}}_0+t\vec{m}$) and parametric equations, and make connections between a scalar equation, a vector equation, and parametric equations of a line in two-space