Solve the problem. See Example 9.
Carbon dioxide emission. Worldwide emission of carbon dioxide (CO2) increased linearly from 14 billion tons in 1970 to 26 billion tons in 2000 (World Resources Institute, www.wri.org).
a) Express the emission as a linear function of the year in the form y = mx + b, where y is in billions of tons and x is the year. [Hint: Write the equation of the line through (1970,14) and (2000, 26).]
b) Use the function from part (a) to predict the worldwide emission of CO2 in 2015.
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