The equation $y = -2$ represents a horizontal line on a Cartesian coordinate plane. This line is parallel to the x-axis and intersects the y-axis at the point $(0, -2)$. The value of $y$ is always $-2$, regardless of the value of $x$.

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Here are 5 related questions:

1. What is the general form of a linear equation?
2. How do you graph a line given its equation?
3. What is the slope of the line represented by $y = -2$?
4. How would the graph change if the equation were $y = 2$ instead?
5. How can you determine the x-intercept of a line?

Tip: The slope of a horizontal line like $y = -2$ is always zero.