The equation provided in the image is $y = 4x - 8$.

This is in slope-intercept form, $y = mx + b$, where $m$ is the slope and $b$ is the y-intercept.

In this case, the slope $m$ is $4$.

So, the answer to the question is B. 4.

Would you like further clarification, or do you have any questions?

Here are 5 related questions you might find interesting:

1. What is the y-intercept of the line $y = 4x - 8$?
2. How do you determine the slope of a line from two given points?
3. What does a negative slope indicate about the direction of a line?
4. How does changing the slope affect the steepness of a line?
5. What would the equation of a line parallel to $y = 4x - 8$ look like?

Tip: The slope of a line measures how much the line rises or falls as you move from left to right across the graph. A positive slope means the line rises.