Desmos is a website that can be used to show the ways that a number sequence and or pattern can be graphed to show how it looks on a graph. Desmos shows the points on a graph where the numbers entered touches on the Y and X axis. This website is a great way for people (students and teachers) to be able to check their work as it gives a visual representation of how their work is shown on a graph.
Here is an example of an equation put into desmos:
This shows how the points on the answer show on the Y and X axis.