slope can be thought of as the average rate of change in one quantity per unit change in another. use the concept of slope to answer the following question. the price of computers has been dropping for the past ten years. if a desktop pc cost $5,700 ten years ago, and the same computing power cost $400 two years ago, find the rate of decrease per year. assume that a linear model applies
lets use points (-10,5700) and (-2,400) where x=years ago and y=cost slope=(5700-400)/(-10+2)= -5300/8= -662.5 Therefore we have an average decrease of $662.50 per year.