This subject covers the essential concepts and applications of functions in high school mathematics, preparing students for advanced mathematical reasoning.
The vertical line test is a quick and easy way to check if a graph represents a function. If any vertical line crosses the graph more than once, it's not a function. Use this strategy to double-check your answers on test day, especially when working with graphs.
Drawing vertical lines on a graph to make sure each line only hits once.
Spotting that a circle fails the vertical line test and isn't a function.