Translate ABC to the right 2 units and down 4 units.
Step-by-step explanation:
Focus on how you count the squares, look at the blue triangle and then at the pink one. You count the A first to the right so it gets you the answer of 2 units to the right now count the same A and proceed to locate where the A' is so you count 4 squares as you get down to the A'. I hope this helped you understand (-_-;")