I am in need of some help with the following problem;

Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26 and in January 2006 the price of regular unleaded gasoline was $2.31 (Bureau of Labor Statistics, 2006). Use the coordinates (1997, 1.26) and (2006, 2.31) to find the slope (or rate of change) between the two points. Describe how you arrived at your answer.

2 answers

Is this like m= y2-y1 over x2-x1?
How can I get the change from a $100if I purchase 31.9 litres of gas at a cost of96.7 cent per litre