Algebra-1

Question Analysis
This question tests the understanding of the concept of zero slope for a horizontal line. The problem provides two points on a horizontal line and asks for the slope.

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

Step-by-step Solution
1. Identify the given points: (1, 8) and (6, 8).
2. Use the slope formula: .
3. Substitute the coordinates into the formula: