The equation of a horizontal line passing through a specific point $(x_1, y_1)$ can be written as:

$y = y_1$

Given the point $(8, -30)$, the equation of the horizontal line passing through this point is:

$y = -30$

This equation indicates that the line is horizontal and crosses the y-axis at $-30$.

Would you like more details or have any questions about this?

Here are 5 related questions:

1. What is the equation of a vertical line passing through the point $(8, -30)$?
2. How would the equation change if the line was vertical?
3. What is the slope of the horizontal line $y = -30$?
4. How does the equation of a horizontal line differ from that of a diagonal line?
5. Can you describe how to find the distance between two points on a horizontal line?

Tip: Horizontal lines have a slope of 0, and their equations are always in the form $y = c$, where $c$ is a constant.