Here, we can make 2 points
30 feet below the surface of water 10 seconds after he entered the water
100 feet below the surface of water after 40 seconds
So, we have (10,30) and (40,100)
Slope = y2-y1 / x2-x1
So, lets substitute the values of the slope
m = (100-30)/ (40-10)
= 70/30
= 7/3
m = 2 1/3 or 2.33
