Chapter 5.1, Problem 32EQ

In Exercises 29-32, use Exercise 28 to determine whether the given orthogonal matrix represents a rotation or a reflection. If it is a rotation, give the angle of rotation; if it is a reflection, give the line of reflection.

$\left[\begin{array}{l}\begin{array}{cc}-\frac{3}{5}& -\frac{4}{5}\end{array}\\ \begin{array}{cc}-\frac{4}{5}& \frac{3}{5}\end{array}\end{array}\right]$