If $x$ varies directly as $y$, then the graph of $y$ versus $x$ is:

If $x$ varies directly as $y$, then the graph of $y$ versus $x$ is:
  1. A straight line through the origin
  2. A rectangular hyperbola
  3. A parabola
  4. A circle

Solution

Direct proportion gives $y = k x$, which is a line through the origin with slope $k$.

Asked in: IMO

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