The cost of an LCD TV dropped from $825 in 2012 to $575 in 2014
Since it is a linear model, the rate of change of cost is constant
So rate of change (slope) = [tex]\frac{575 - 825}{2}[/tex] = -125
To find the cost of every year we subtract 125 from the cost of previous year
In 2014, the cost of an LCD TV = $575
In 2015, the cost of LCD TV = $575 - 125 = $450
the cost of a TV in 2015 is $450
