The Consumer Price Index​ (CPI), which measures the cost of a typical package of consumer​ goods, was 219.8 in 2011 and 243.5

in 2016. Let xequals
11
correspond to the year 2011 and estimate the CPI in 2012

and 2014
.
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.
Let y represent the CPI. The linear equation that best models the CPI is nothing
.