Question

Find the domain: { (2, 1) , (6, 4) , (7, 7) , (7, 10) }

Answer 1

2, 6, and 7 are the domain because they are in the "x" spot

Answer 2

The answers is:
D={2,6,7}
You know that it is the domain because it is at the beginning of the parenthesis and is always x.
(x,y) if you were looking for y you would be looking for the second number in the parenthesis and that is know as range.