Yes.
Graphs are diagrams that show information in a clear and simple way.
they're just a way to show information
All graphs show patterns. Bar charts are one way to show comparisons between groups.
Graphs are a convenient way to impart information to some people, and graph paper simplifies the process of producing graphs.
they are important because they show information in an easier way then writing. you could out on a line graph results of a experiment/or lots more things
Information
A graph is a visual representation of numerical or other information, often used for comparative purposes. Mathematical graphs include those in geometry that indicate points, lines, and curves within a Cartesian coordinate system. Other types of graphs (bar graphs, pie graphs) display numerical values or percentages as lengths or areas, and may use colors to indicate the data for more than one set of values.
The way you can use graphs of polynomial functions to show trends in data is by comparing results between different functions. The alternation between the data will show the trends. Time can also be used to show the amount of variation.
A majority of people find it easier to grasp visual information rather than tables of numbers.
People use line graphs in businesses, and to compare data. Line graphs are mostly used when people are entrepreneurs. They figure out profit this way. Line graphs are also used when a product is made. They decide if they should continue to make this product, by how well the product sells. Line graphs show the change.
A way to organize this is to use graphs yes but also to have explanation. use the scientific inquiry to finish these graphs off. first question second hypothesis third your progress and finally the conclusion. after that use a graph or two to show your progress. hope you liked this answer!
Multivariate is probably the most accurate answers. Graphs need not be bivariate - you can have graphs in 3 or more dimensions - not easy to visualise in more than 3-d but that does not mean they cannot exist. Graphs need not represent exact relationships - as any scattergram will demonstrate. Graphs are simply visual representations of information, presented in a form that [hopefully] conveys he information in an effective way. For one of my favourite semi-numeric graphs follow the link to see a graphical representation of Napoleon's invasion of Rusia.