(x,y)→(x+2,y+3), That adds +2 to the first coordinate, and adds +3 to the second coordinate then (x,y)→(x-5,y+7), That adds -5 to the first coordinate, and adds +7 to the second coordinate then (x,y)→(x+13,y). That adds 13 to the first coordinate, and adds 0 to the second coordinate. So altogether we have added +2-5+13 = 10 to the first coordinate, and added +3+7+0 = +10 to the second coordinate So the single translation is (x,y)→(x+10,y+10) Edwin