If two points on a line are $$(5, 3)$$ and $$(9, 3)$$ , the ...

Question Analysis
This question assesses the ability to calculate the slope of a line using the slope formula when the y-coordinates of the points are the same. The slope of a horizontal line is 0.

Key Concept Explanation
The key concept here is that if the y-coordinates of two points are the same, the line is horizontal, and the slope is 0.

Step-by-step Solution
1. Use the slope formula:
2. Substitute the points: