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The line doesn't go through the origin
If the functional relationship is of the form y = cx where c is the constant of variation. In graphical form, it is a straight line through the origin.
All direct variation graphs are linear and they all go through the origin.
Graphs of direct variation pass through the origin so the y-intercept would be 0.
Constant variation is a relationship between two variables where one is a fixed multiple of the other. The graph of such a relationship is a straight line through the origin.