We can get a line graph from a bar graph by joining only the midpoints of the top edges of the bars.
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A line graph displays data that continuously changes over a period of time. It is obtained from bar graphs and histograms (every histogram is a bar graph) by joining the mid-point of the top edges of every bar conventionally. Actually, it can be obtained by joining the points at relatively same position on the top edge of every bar because height of all the points on the top edge of any bar is same.