The linear functiony=2x+26

y =2x+26

models the average cost of a haircut in a certain city, wherey, is the average price of a haircutx years after 1990. Find the slope for the model. Then describe what this means in terms of the unit rate of change in the average cost of a haircut over time.

a)m=

b) The average cost of a haircut in this city _____

(Enter:increasedordecreasedornot changed) at a rate of_______ per year after 1990.