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In a certain lake, a 1-year-old bluegill fish is 3 inches
long, while a 4-year-old bluegill fish is 6.6 inches long.
Assuming the growth rate can be approximated by a
linear equation, write an equation in slope-intercept
form for the length of a bluegill fish in inches after
t years. Then use the equation to determine the age of
a 9-inch bluegill.