The linear function y=2x + 26 models the average cost of a haircut in a certain city, where ty, is the average price of a haircut r years after 1995. 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 (enter increased or decreased or not changed) at a rate of b) the average cost of a haircut in this city per year after 1995