Answer:
Explanation:
vertical line test: a test that uses any kind of straight stuff (i.e line, pen, etc.) to go over the graph and check whether or not there are two points on one vertical line.
In a function, one domain (x value) can only have one range (y value).
NOTE: one range can have multiple domains
This means through vertical line test, if there are two points on one vertical line, it will not be a function.