Suppose that the consumer price index (CPI), which meansures the cost of a typical package of consumers goods, stood at 140.7 in 1990 and 190.7 in 2000. Let x=0 correspond to 1990, and establish the CPI in 1998 and 2004.
Which linear equation best models the CPI?
A) y=-5x+140.7
B) y=5x-140.7
C)y=5x+140.7
In 1998, the CPI would be appropriately___
In 2003, the CPI would be approximately___