.
In this pair (1,6), the first number, "1", represents "x",  while the second number, "6", represents "y".
So, what is the left  side of the given equality ?  - It is "y", i.e. 6.
    What is the right side of the given equality ?  - It is  x + 6 = 1 + 6 = 7.
Now, is 6 less than 7 ?   - YES, it is.
Hence, the pair (1,6)  IS  the solution of the given inequality.