Concept explainers
The bar graph shows the percentage of Americans who used cigarettes, by ethnicity, in 1985 and 2005. For each of the groups shown, cigarette use has been linearly decreasing. Use this information to solve Exercises 95–96.
In this exercise, let x represent the number of years after 1985 and let y represent the percentage of Americans in one of the groups shown who used cigarettes.
Use the data points (0, 38) and (20, 27.3) to find the slope-intercept equation of the line that models the percentage Ot African Americans Who used cigarettes, y, x years after 1985. Round the value of the slope m to two decimal places.
Use the data points (O, 40) and (20, 24.2) to find the slope-intercept equation of the line that models the percentage of Hispanics who used cigarettes. y, x years after 1985
Use the models from parts (a) and (b) to find the year during which cigarette use was the same for African Americans and Hispanics. What percentage of each group used cigarettes during that year?
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Intermediate Algebra for College Students (7th Edition)
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