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A double bar graph would tell us.
What dose a line graph tell you about the relationship between the variables in an experiment
Test it by the vertical line test. That is, if a vertical line passes through the two points of the graph, this graph is not the graph of a function.
Whether the graph has 0, 1 or 2 points at which it crosses (touches) the x-axis.
The graph must be linear and pass thru the origin