An article on the cost of housing in California that appeared in the San Luis Obispo Tribuneincluded the following statement: "In Northern California, people from the San Francisco Bay area pushed into the Central Valley, benefiting from home prices that dropped on average $4,000 for every mile traveled east of the Bay area." If this statement is correct, what is the slope of the least-squares line,=a+bx,

wherey= house

price(in dollars)andx= distance

east of the Bay(in miles)?