The graph you've provided is a plot of the equation $y = -4$. This is a horizontal line that passes through all points where the $y$-coordinate is $-4$.

Key details:

• The equation $y = -4$ means that for every point on the line, the $y$-value remains constant at $-4$, regardless of the $x$-value.
• The line is parallel to the $x$-axis and intersects the $y$-axis at $-4$.

Would you like further explanation or any additional details?

Here are 5 follow-up questions related to this graph:

1. How do we identify whether a line is vertical or horizontal from its equation?
2. What is the slope of a line defined by $y = -4$?
3. Can you write the equation of a vertical line that passes through the point $(2, -4)$?
4. How does the graph of $y = -4$ differ from the graph of $x = -4$?
5. If the equation was $y = x - 4$, how would the graph change?

Tip: Horizontal lines always have a slope of 0, while vertical lines have an undefined slope.