Verified Answer :

5/0 UNDEFINED... The answer is a vertical line.

To figure the slope of a line, you can either use \(\frac{rise}{run}\) or \(m = \frac{y2 - y1}{x2 - x1}\). Remember, 'm' represents the slope of the line.

We can use the point (12, 10) as (x1, y1) and the point (12, 5) as (y1, y2):

\(m = \frac{5 - 10}{12 - 12}\)

\(m = \frac{-5}{0}\)

\(m = 0\)

So, the answer is 0, which means the slope is undefined.