You only need to type in the numbers. The parenthesis are already taken care of, and the same applies for the comma as well.
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Explanation:
The drawing is below.
Start at the bottom left corner of the grid which is the location (0,0) known as the origin.
Move 1 unit to the right and 3 units up to arrive at the location (1,3). Think of it like an address of a house. Imagine each grid line as a street of sorts. Or you can think of it like latitude/longitude.
Once you are at (1,3), move down 2 units to get to (1, 1) which is the answer.