in January 1997 was $1.26, and in January 2006, the price of regular unleaded gasoline was
$2.31 (
Solution
If you have coordinates (1997, 1.26) and (2006,2.31), then plug in the numbers into
the equation. Slope = (y2-y1)/(x2-x1) y2 = 2.31 y1 = 1.26 x2 = 2006 x1 = 1997 slope = (2.31-
1.26)/(2006-1997) = 1.05/9 = .1167