Base in your question the triangle ABC is a triangle that is translated 6 units up and 3 units left and create a new triangle A'B'C'. So if a vertex A is located at a point of (-1,2) the possible coordinates of A' is (-4, 8) and i hope you are satisfied with my answer
(0,0) is the vortex for this problem
Ben is taller
Ben: 5 5/16 feet = 1.61925 meters
Marcus: 5 7/24 feet = 1.6129 meters