What is the slope of the line represented by the equation y=-x+3

Which expression is equivalent to the expression shown?

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Give all possible names for the line shown.calculation tip: lines can be written with either point first.