Point C lies on line segment AB such that the ratio AC : BC is 1:1.' If points B and C have coordinates of (4,-2) and (0,-7), respectively, what are the coordinates of point A?

Me i've asked this question 3 time asapright triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.