In Exercises 55–64, use the vertical line test to identify graphs in which y is a function of x.

Hello. Today we're going to be using the vertical line test to determine whether the graph is a function of X. Now, what the vertical line test states is that if you draw a vertical line at any given point of the graph and it intercepts the graph at exactly one point, then this is a function of X. Here I've drawn four vertical lines. And as you can see, each line intercepts the graph at exactly one point. And since it's intercepting the graph at exactly one point at the four different given points, that means that this is a function of X. So the answer to this problem is going to be a So I hope this video helps you in understanding how to use the vertical line test and I'll go ahead and see you all in the next video.