Use the graph to find the slope. What is the runners speed?

The formula for the slope is

Hope this helps.

頑張って!

y = 0

Step-by-step explanation:

This line has a y-intercept of 0:  (0, 0).  Thus, the equation of this line has the form y = mx + 0, or just y = mx.

As we move from (-3, 0) to (0, 0), x increases by 3 while y stays the same.

Thus, the slope of this line is m = 0/3, or just 0.

A line with a slope of zero is horizontal.

Knowing that this line passes thru (0, 0), we conclude that the equation of the line in question is y = 0 (which is the x-axis).