What is the domain of the function {(2,3),(1,5),(7,9)}?
A. (3,5,9)
B. (-1,2,3,5,7,9)
C. (2,3) (-1,5) (7,9)
D. (-1,2,7)
The domain of a function is the set of all possible values the independent variable can take on. In this case, the independent variable is the first element in each ordered pair.
The first elements in the given ordered pairs are 2, 1, and 7. Therefore, the domain of the function is {2, 1, 7}.
None of the answer choices match this domain exactly. However, answer choice B. (-1,2,3,5,7,9) includes all the numbers in the domain {2, 1, 7}. Therefore, the correct answer is B. (-1,2,3,5,7,9).