The equation y=-1777x+27,153 can be used to predict the number y of gun deaths in the United States x year after 2000, that is, x=0 corresponds to 2000, x=2 corresponds with 2002, x=5 corresponds to 2005, and so on. Predict the number of gun deaths in 2005 and 2007. In what year will the number of gun deaths be 12,937?

There is no answer. x would have to be less than zero which is beyond the bounds where the equation is valid.