Answer:
It's so easy. Domain is the set made up of the first elements of each ordered pair (x, y).
Look at the second relation {(-5, 5), (0, 5), (5, 5)}. It has three ordered pairs which arw (-5, 5), (0, 5) and (5, 5).
First element of the first ordered pair (-5, 5) is -5. First element of the second ordered pair (0, 5) is 0. First element of the third ordered pair (5, 5) is 5.
So, the set made up of the first elements of the ordered pairs is {-5, 0, 5} and hence it is the domain.
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