Use the information given to build a linear equation model, then use the equation to respond. Develop both an algebraic and a graphical solution.
Water level: During a long drought, the water level in a local lake decreased at a rate of 3 in. per month. The water level before the drought was 300 in.
a. What was the water level after 9 months of drought?
b. How many months will it take for the water level to decrease to 20 ft?
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