The purpose of a graph is to present information in a visual form. This is because most people find it easier to understand information that is presented in a visual form.
One of the best examples (my favourite), which presents a large quantity of data in a very effective graphic is Charles Minard's graph illustrating Napoleon's invasion of Russia and his retreat.
//en.wikipedia.org/wiki/French_invasion_of_Russia#Weather_as_a_factor
Florence Nightingale, first female member of the Royal Statistical Society and a pioneer in the use of statistical graphs, used polar area diagrams (a kind of pie chart) to present her findings on deaths in the Crimea to Members of the UK Parliament.
//en.wikipedia.org/wiki/Florence_Nightingale#mediaviewer/File:Nightingale-mortality.jpg
The scale is the numerical system that is used to define the axis of a graph.
You can definitely use a table or graph to what your findings. You can use a bar graph for this purpose for example.
To visually display information.
If a graph is a function, it will always have y=... or x=... (or anoher letter equals an equation) for example y= 3x-12 is a function
In a circle graph it is easier to see shares of the total than in other kinds of graphs.
The scale is the numerical system that is used to define the axis of a graph.
A graph whose purpose is inexplicable!
The main purpose of a line graph is to show changes and patterns in the changes
its a guideline
3or9
It can be - depends on the purpose.
to define
You can definitely use a table or graph to what your findings. You can use a bar graph for this purpose for example.
To visually display information.
because
Any graph can be used for such a purpose.
The scale is the numerical system that is used to define the axis of a graph.