the slope
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direct variation, and in the equation y=kx the k ca NOT equal 0.
The constant of variation in an http://wiki.answers.com/Q/inverse-variation.html is the constant (unchanged) product between two variable quantities.The formula for indirect variation is xy = k..where k is the constant of variation.The constant of variation in a http://wiki.answers.com/Q/direct-variation.html is the constant (unchanged) ratio of two http://wiki.answers.com/Q/variables.html quantities. The formula for direct variation is y = kx..where k is the constant of variation.
The slope of the graph of a direct variation is always positive.
Direct variation.
k is the constant of variation and is the gradient (slope) of the relevant graph.