The product manager at a subsidiary of Kraft Foods Inc is interested in learning how sensitive sales are

Question

The product manager at a subsidiary of Kraft Foods, Inc. is interested in learning how sensitive sales are

to changes in the unit price of a frozen pizza in Dallas, Denver, Baltimore, and Chicago. The product manager has been provided data on both Price and Sales volume every fourth week over a period of nearly four years for the four cities (Frozen Pizza).

With a regression line as follows: y = 126624.8913 – 34955.59942 (Baltimore Price) how do I determine if the relationship is positive, negative or no relationship exist?
Statistics and Probability