Question

What is the domain of function $g$ defined by a set of ordered pairs as follows: $g=\left\{\right(3,2),(5,9),(6,9),(11,0\left)\right\}$

• A. $\{2,9,9,0\}$
• B. $\{3,5,6,11\}$
• C. $\{3,9,9,11\}$
• D. $\{2,5,6,11\}$

Answer 1

The correct option is B $\{3,5,6,11\}$

$g=\left\{(3,2),(5,9),(6,9),(11,0)\right\}$ is a function that says

"$3$ is related to $2$", "$5$ is related to $9$", "$6$ is related to $9$" and "$11$ is related to $0$".

Since the domain of the set of ordered pairs is always the input values, Hence, the domain of the given function is $\left\{3,5,6,11\right\}$.