Question

Which of the relations has a domain of {-5, 0, 5}?

{(-5, 0), (0, 5), (1, 0)}
{(-5, 5), (0, 5), (5,5)}
{(0, -5), (0, 0), (0, 5)}

Answer 1

Domain=x set of values

Answer 2

Match the x values (given) with the options

Answer 3

Example:

Let's say we're given this relation (set of ordered pairs)


\[\Large \left\{(1,2),(5,7),(88,12)\right\}\]


Let's mark the x coordinate of each point in red


\[\Large \left\{({\color{red}{1}},2),({\color{red}{5}},7),({\color{red}{88}},12)\right\}\]


as @pooja195 is saying, the domain is the set of x values of each point. So in my example, the domain is this set \[\Large \left\{{\color{red}{1}},{\color{red}{5}},{\color{red}{88}}\right\}\]