Try the following ACT math practice question that tests your understanding of reflection of straight lines in the coordinate plane.

Let $y=mx+b$ be the image when the line $x-3y+11=0$ is reflected across the $x$-axis. The value of $m+b$ is

- $\quad -6$
- $\quad -5$
- $\quad -4$
- $\quad -3$
- $\quad -2$

**Video Explanation**