Try the following ACT math practice question that tests your understanding of reflection of points across the vertical axis and straight lines in the coordinate plane.

In the $xy$-coordinate plane, point $A$ is the reflection of the point with coordinates $(4, 2)$ across the straight line $y = x$. If point $B$ is the reflection of point $A$ across the $y$-axis, what are the coordinates of point $B$?

- $\quad (2, -4)$
- $\quad (-2,-4)$
- $\quad (-2, 4)$
- $\quad (-4, -2)$
- $\quad (-4,2)$

**Video Explanation**