The sum of the speeds of the two trains is 721.5 miles per hour. If the speed of the first train is 4.5 mph faster than the second train find the speech of each

Aline is perpendicular to another line m2= (-1/m1), where m1 is the slope of the original line and m2 is the slope of the perpendicular line. which of the following equations represents the line that passes through the point (-2,1) and is perpendicular to the line below?