Question

Is this a function and what's the domain and range. thanks!

Answer 1

This is not a function. Why not? Because it fails the vertical line test. The input x = 3 leads to more than one output (eg: y = 1, y = 2, y = 3). A function is only possible if each input leads to exactly one output.

Domain = {3} so basically x is only allowed to be x = 3.

Range = set of y values such that y is between 1 and 5 (including both endpoints. As a compound inequality, the range is written as $1 \le y \le 5$

Answer 2

The domain is the x coordinates (input) and the Y is the range , (output). Hope this helps. :)