You can put this solution on YOUR website! A translation is like sliding the object over a certain distance.
We all know that we see our "reflection" in a mirror; it would look just the same on the other side of the line, and we have the line of symmetry where the picture is symmetrical in respect to the line.
Example: when we reflected the , we sort of flipped it over that "mirror," or the line, so the would be on the opposite side of the point , like this:
___________A_____________|_____________A1_________
...............................................................|
...............................................................|
...............................................................^ the line of symmetry
