The line in the graph starts at the point $(9, 0)$ and ends at approximately $(-9, 8)$.

Step 1: Calculate the rise (vertical change)

The rise is the difference in the $y$-coordinates: $\text{Rise} = 8 - 0 = 8$

Step 2: Calculate the run (horizontal change)

The run is the difference in the $x$-coordinates: $\text{Run} = -9 - 9 = -18$

Step 3: Determine the slope

The slope of a line is calculated as: $\text{slope} = \frac{\text{rise}}{\text{run}} = \frac{8}{-18} = \frac{4}{-9} = -\frac{4}{9}$

Thus, the slope of the line is $-\frac{4}{9}$.

Let me know if you need more details or if you have any questions!

Here are 5 related questions you might consider:

1. How would the slope change if the line was steeper?
2. What does a positive slope represent compared to a negative slope?
3. How can you determine the equation of the line from the graph?
4. What is the y-intercept of the line in this case?
5. How would you find the slope if the points were not given but you had the equation of the line?

Tip: When calculating slope, always remember that a negative slope means the line is slanting downwards from left to right!