The vertical-line test is used on a graph to decide whether a relation is:

  1. a function
  2. linear
  3. a set
  4. an inverse
Answer

A) a function

If any vertical line meets the graph more than once, some x has two y values, so it is not a function. SLO M-09-A-16 · Application

Mathematics MCQ · More Sets and Functions MCQs · Practise