Yes it can. If it is a function, each x value has only one y value and this will help determine if each x value has one and only one y value. In a function, a y value can have multiple x values so don't sweat it if that happens.
True Or False: The Vertical Line Test Can Help You Determine If You Have A Function Or Not?
1.Which ordered pair below has an x-coordinate value of 3, and a y-coordinate value of –2?
(3, –2)
(3, –2)