Algebra-1

Question Analysis
This question tests the understanding of the slope of a horizontal line given by an equation. The equation represents a horizontal line where the y-value is constant.

Key Concept Explanation
The key concept here is that the slope of a horizontal line is always zero, as there is no change in the y-value as the x-value changes.

Step-by-step Solution
1. Recognize that the equation represents a horizontal line.
2. Recall that the slope of a horizontal line is given by the formula