This week in math 10 we learned about Function Notation, one part of this is on a graph and seeing if it can pass the vertical line test. Basically the vertical line test is to see if it is a function or not a function, to do this you would look at a graph and see if any of the vertical lines/ the y-axis has two points or if it only has one for each x-axis
for example
this graph would be a function because it passes the vertical line test, it doesn’t have more the one point on the y-axis
another example
this one would not be a function because there a two y-axis points for a x-axis
last example
this one looks a little confusing but looking at it, this one is also a function because it still only has one point per x-axis