To represent data on graphs u hv to first choose the x-axis and y-axis. After this u must choose a scale...for example: 1 big square = 5 units or 10 and so, After this u can construct the bar graph
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Firstly scale must be written on the top right.scale are used for measurement of the values.
Two different data can be represented by means of X-axis and Y-axis respectively.
Then the points for example (2,3) should be pointed such that 2 in X-axis  and 3 in Y-axis and the intersection of both points are marked.
Similarly series of points are obtained.