Suppose that the consumer price index (CPI), which measures the cost of a typical package of consumer goods, stood at 118.3 in 1990 and 168.3 in 2000.

Let x = 0 correspond to 1990 and estimate the CPI in 1995 and 2005. (Assume that the data can be modeled by a straight line.)

Which linear equation best models the CPI?

A. y = - 5x + 118.3

B. y = 5x + 118.3

C. y = 5x - 118.3

a. In 1995, the CPI would be approximately

b. In 2005. the CPI would be approximately