What could be explained from the straight horizontal line observed at the begining and end of the graph?
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The graph of a relation of the form y = 5 is a line parallel to the x-axis because the y value never changes.
A line parallel to the x-axis is called a horizontal line.
The graph of a relation of the form x = 5 is a line parallel to the y-axis because the x value never changes.
A line parallel to the y-axis is called a vertical line.
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just
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It represents the latent heat which is used for weakening the bonds while conversion from one state to other
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