I'd like an explanation on how to solve this :))

14. [0.22/0.44 Points] DETAILS PREVIOUS ANSWERS PECKSTAT2 4.E.037. MY NOTES An article on the cost of housing in Californiat included 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." If this statement is correct, what is the slope of the least-squares regression line, y = a + bx, where y = house price (in dollars) and x = distance east of the Bay (in miles)? :......m: X Enter an exact number. Explain. This value is the change in the average home price, in dollars, for each increase of 1 mile in the distance east of the bay