Algebra-1

Question Analysis
This question tests the understanding of the concept of zero slope. A horizontal line has a constant y-value, which means the change in y (Δy) is zero for any change in x (Δx).

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 line is horizontal.
2. Recall that the slope of a horizontal line is given by the formula .
3. Since

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