Question

How do you use the vertical line test to determine whether `{(2,5), (3,-5), (4,5), (5,-5)}` is a function?

Answer 1

See explanation.

Explanation:

Connect the points in the order given.

Draw any line parallel to the y-axis such that the x-axis intersection is within the ranges `x=2 to 5` inclusive. The vertical line will cross the plotted line just once. Thus there is only one y-value for each x-value