Infinitely many, starting with:
6 + 6 = 12
8 + 4 = 12
10 + 2 = 12
12 + 0 = 12
14 + (-2) = 12
16 + (-4) = 12
...
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100
2 + 164 + 146 + 128 + 104 pairs of even numbers can be found whose sum is eighteen.
-- There are 11 even numbers that are less than 1/2 of 46. -- Each of those can be paired with another even number that is more than 1/2 of 46. -- So there are 11 possibilities.
Y is the second number in a set of ordered pairs.
I think of factor pairs of 24, like 8 and 3, that add up to 11.