Chapter 12.1, Problem 18ES

Sketch the line segment represented by each vector equation.

$\begin{array}{l}\left(\text{a}\right)\text{r}=\left(1-t\right)\left(\text{i}+\text{j}\right)+t\text{k};0\le t\le 1\\ \left(\text{b}\right)\text{r}=\left(1-t\right)\left(\text{i}+\text{j}+\text{k}\right)+t\left(\text{i}+\text{j}\right);0\le t\le 1\end{array}$