Chapter 8, Problem 8RE

The bar graph in the next column shows the percentage of Americans who used $$$. by ethnicity, in 1985 and 2005. For each of the groups shown, cigarette use has been linearly decreasing.

Source: Department of $$$ and Human Services

In 1985. 38% of African Americans used cigarette, For the period shown by the graph. this has decreased at an average rate of 0.54% per year. Write a function that models the percentage of African Americans who used $$$, y, x

Years after 1985.

The function $0.79x+y=40$

models the percentage of Hispanics who used cigarette, y, x years after 1985. Use this model and the model you obtained in part (a) to determine the year during which cigarette use was the same for African Americans and Hispanics, What percentage of each group used cigarette during that year?