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The slope of the graph of a direct variation is always positive.
Positive or Negative........I think...
k is the constant of variation and is the gradient (slope) of the relevant graph.
Graphs of direct variation pass through the origin so the y-intercept would be 0.
Two variables, X and Y, are in direct variation if Y = kX for some constant k. The graph of Y as a function of X will be a straight line through the origin.