A line passes through the points $$ (1, 12) $$ and $$ (1, 18...

Question Analysis
This question tests the student's ability to find the slope of a line using the given points. The formula for the slope is .

Key Concept Explanation
The slope of a line is the ratio of the vertical change (rise) to the horizontal change (run) between two points on the line. If the denominator is zero, the slope is undefined.

Step-by-step Solution
1. Identify the coordinates of the two points: and