The vector equation of a line is a fundamental concept in analytical geometry, providing a concise way to describe lines in both two-dimensional and three-dimensional space. This equation is expressed as:
$$ \mathbf{r} = \mathbf{a} + \lambda\mathbf{b} $$
Where:
The vector equation of a line essentially describes the line as a set of points that can be reached by starting at a fixed point $\mathbf{a}$ and moving in the direction of $\mathbf{b}$ for some distance determined by $\lambda$.
In 3D space, if we know the line passes through the point (1, 2, 3), then
\[\mathbf{a} = \begin{bmatrix} 1 \\ 2 \\ 3 \end{bmatrix} \]
If the line is parallel to the vector \(\mathbf{b} = \begin{bmatrix} 2 \\ -1 \\ 3 \end{bmatrix} \), then we can use this as our direction vector $\mathbf{b}$.
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