A geologist gathered data about the total shoreline and maximum depth of several area lakes and organized the data into this table.

Total Shoreline (miles) 22 17 10 23 12 35 7
Maximum Depth (feet) 101 85 59 113 64 158 33

She then used a graphing tool to display the data in a scatter plot, with x representing the total miles of shoreline and y representing the maximum depth. She also used the graphing tool to find the equation of the line of best fit:

y = 4.26x + 10.908.

Based on the line of best fit, what is the approximate maximum depth of a lake that has 31 miles of shoreline?



Answer :