Study guide and 6 practice problems on:

## Finding a perpendicular vector

There are multiple ways to find a vector perpendicular to the vector $\mathbf{x}$:
A vector perpendicular to $\mathbf{x} = \langle a,b \rangle$ is $\langle -b, a \rangle$.
Write and solve the equation $\mathbf{x} \cdot \mathbf{y} = 0$.
Take the cross product with any vector that is not a multiple of $\mathbf{x}$.