Postage Stamp Price Price (cents)

50

40

30

20

10

1960 1970 1980 1990 2000 2010

The equation of the line of fit is y = -0.71 +0.86x, where y represents the predicted prince, in cents, of a stamp and x represents the

number of years since 1958

In 1958, the price of a postage stamp was 4 cents. The price remained the same until 1963, when the price increased. Based on the

information shown in the scatter plot, what is true about the model for the years from 1958 to 1963?