The rate of change in the diver's elevation can be calculated by finding the slope of the line passing through the two points.
Let's use the points (0,0) and (3,-60) to find the rate of change:
Slope = (change in elevation) / (change in minutes)
Slope = (-60 - 0) / (3 - 0)
Slope = -60 / 3
Slope = -20
Therefore, the rate of change in the diver's elevation is -20 feet per minute.