Verticle and Horizontal line test

Verticle line test: -Functions are only functions if they pass the verticle line test. The verticle line test is when you run a verticle line over a graph and see if in any places on the graph, the line hits more than one point. Horizontal Line test: You use the horizontal line test to see if a function is one-to-one. Similar to the vertical line test, you run a horizontal line across the graph and if the line gets to a point where it hits two points, then the funciton isn't one-to-one.