Solve the problem. See Example 9.
World energy use. Worldwide energy use in all forms increased linearly from the equivalent of 3.5 billion tons of oil in 1970 to the equivalent of 6.5 billion tons of oil in 2000 (World Resources Institute, www.wri.org).
a) Express the energy use as a function of the year in the form y = mx + b where x is the year and y is the energy use in billions of tons of oil.
b) Use the function from part (a) to predict the worldwide energy use in 2015.
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