The cost of a tv dropped from $265 in 2012 to $199 in 2014. Find the average rate (slope) at which the cost has been decreasing?

It has already been given in the question that the cost of tv has dropped fro $265 in 2012 to $199 in 2014. To find the average rate of decrease in the cost of tv in 2 years we have to subtract the difference in price and then divide it by 2 to get to the actual result that is needed.

Difference in price of tv = (265 - 199) dollars

= 66 dollars

so the difference in price of tv in 2 years is $66

Then

The average rate of decrease in cost of tv = 66/2

= 33

So $33 is the average rate of decrease in the price of tv between the years 2012 and 2014.