The Consumer Price Index (CPI) measures the cost of a typical package of consumer goods. In January of 2009, the CPI was 211.9, and in January 2021, the CPI was 280.2. Assume that the CPI is a linear function of time.
a) Using the slope and y intercept from your previous problem (with x = 0 to represent the year 2009), write the linear equation. y=Blank 1 x+_____ Blank 2