A plot of time versus the price of a best selling model of television has a horizontal units of years since 2000 and vertical units of dollars the best fit line of the data are defined by the equation...

A plot of time versus the price of a best selling model of television has a horizontal units of years since 2000 and vertical units of dollars the best fit line of the data are defined by the equation y=-75x+550 where x= year and y = price what are the units of the slope