Question

What are the inputs of the following function?

{(-3, 2), (-4, 2), (8,3), (7, 1)}

A. {-4, -3, 7, 8}
B. {1, 2, 3, 7, 8}
C. {1, 2, 3}
D. {-4,-3, 1, 2, 3, 7, 8}

Answer 1

A. {-4, -3, 7, 8}

Explanation:

The ordered pairs representing a function are always written ...

(input, output)

Inputs

The set of inputs for the given function is the list of first-numbers of the ordered pairs. Those numbers are -3, -4, 8, 7. When we express them as a set, we like to have the elements of the set in increasing order:

inputs = {-4, -3, 7, 8} . . . . . . matches the first choice