The slope of the line is

Step-by-step explanation:
Given that the line contains the points (-1,9) and (9,9)
We need to determine the slope of the line.
Slope:
The slope of the line can be determined using the formula,

The slope of the line can be determined by substituting the points (-1,9) and (9,9) in the above formula.
Thus, substituting the values, we have;

Simplifying, we get;


Thus, the slope of the line is
