The graph shows the percentage of high school seniors who used alcohol or marijuana during the 30 days prior to being surveyed. The data can be described by the following mathematical models, where n is the number of years after 1980, A is the percentage of seniors using alcohol, and M is the percentage of seniors using marijuana. A=-0.8+57 M=-0.5n+23 Percentage Alcohol and Marijuana Use by High School Seniors 80- 70- 60- 504 404 30- 204 104 04 1980 1985 1990 1995 2000 05 09 Year Alcohol Marijuana Q

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