Many of the following problems can be modeled with a linear equation. Analyze them and identify what quantities the variables x and y represent. The information provided in the problems is adequate to determine a point and a slope or two points on the line.
The Consumer Electronics Association estimates that 28.6 million smart phones were sold in 2008 and sales have increased 12.7 million per year.
(a) Assume that this is a linear trend and write the linear equation that expresses the number of smart phones sold as a function of the number of years since 2008.
(b) Use the equation in (a) to estimate the number of smart phones sold in 2015. (c) Estimate when sales will reach 150 million.
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