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anonymous

  • 5 years ago

A study by the Partnership for a Drug-Free America indicated that, in 1998, 42% of teens in grades 7 though 12 had recently used cigarettes. A similar study in 2005 indicated that 22% of such teens had recently used cigarettes. Write a linear model that relates the percent of teens that recently used cigarettes y to the number of years after 1998, x.

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  1. mathteacher1729
    • 5 years ago
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    Consider 1998 as year "zero". That means 2005 is year "seven". The question is now this: Find the equation of the line through the points: (0,42) and (7,22) Hope this helps. :)

  2. anonymous
    • 5 years ago
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    if we assume x as year and y as percentage we have 2 points (1998,42) & (2005,22) so y=(-20/7)*(x-1998)+42.

  3. anonymous
    • 5 years ago
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    Thank you very much :)

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