Question

(2,3), (-1,5), (0,-1), (3,5), (5,0) What’s the domain?

Answer 1

let's recall that the domain of a set is always the list of all x-coordinates in each pair.

$\bf \stackrel{\large Domain\qquad \{2,-1,0,3,5\}}{(\stackrel{\downarrow }{2}~~,~~3),(\stackrel{\downarrow }{-1}~~,~~5),(\stackrel{\downarrow }{0}~~,~~-1),(\stackrel{\downarrow }{3}~~,~~5),(\stackrel{\downarrow }{5}~~,~~0)}$