You probably can use Microsoft Works Spreadsheet program. Many computers have this already installed with Windows. A good way to begin in to click on Help, which will give you some instructions and examples. (Click Help, then Works Help, then Work with Charting Basics) . Note that Microsoft calls graphs as charts.
I would suggest that you begin with a small, simple set of data, perhaps (x,y) = (1,3), (2, 6) amd (3,9) which will plot as a straight line.
Microsoft Works lets you do many things with the computer, without having to buy expensive programs, like Microsoft Excel.
Good luck!
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A graph can be made quickly on the computer. Sites that offer people the ability to make graphs include Chart Go, Math Is Fun, and Online Chart Tool.
Import your data into an Excel spreadsheet. Select the data appropriately and choose the graph you would like to present your data in. You can use chart wizard to do this.
time and amount of item that you are using...
Initially, the equation can be directly realized using Matlab source code. Then various inputs can be applied to it. These values can easily be plotted on a graph using plot or stem command in Matlab.
A line graph