Graphs of direct variation pass through the origin so the y-intercept would be 0.
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Yes. y = 1x is the same as y = x which is the simplest case of direct variation. If you consider the equation y = mx + b, then a direct variation will always have b = 0 (i.e. the graph goes through the origin). The value of m is called the "constant of variation", and the equation is usually written as y = kx.
The slope of the graph of a direct variation is always positive.
No.
Positive or Negative........I think...
k is the constant of variation and is the gradient (slope) of the relevant graph.