The Consumer Price Index (CPI), which measures the cost of a typical package of consumer goods, was

220.6

in 2011 and

236.4

in 2016. Let

x=11

correspond to the year 2011 and estimate the CPI in

2012

and

2015.

Assume that the data can be modeled by a straight line and that the trend continues indefinitely. Use two data points to find such a line and then estimate the requested quantities.

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Part 1

Let y represent the CPI. The linear equation that best models the CPI is

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