The graph of the equation $y = -1$ is a horizontal line.

• Since the equation $y = -1$ does not depend on $x$, the value of $y$ remains constant at $-1$ for all values of $x$.
• This results in a straight, horizontal line passing through $(x, -1)$ for all values of $x$.

In summary:

• The line crosses the $y$-axis at $y = -1$.
• The slope of the line is 0, meaning it is perfectly flat and horizontal.

Would you like to see a detailed graph or have further explanations?

Here are some related questions:

1. How would the graph change for $y = c$, where $c$ is a constant?
2. What is the slope of a horizontal line, and how is it calculated?
3. How do vertical lines differ from horizontal ones in terms of their equations?
4. What happens to the graph if we add a term involving $x$, like $y = -1 + 2x$?
5. How does the graph of $y = -1$ compare to the graph of $y = x$?

Tip: Horizontal lines always represent equations where the value of $y$ remains constant, regardless of $x$.