A line passes through $(0,0)$ and $(4,8)$. The equation of the line is:

A line passes through $(0,0)$ and $(4,8)$. The equation of the line is:
  1. $y=x$
  2. $y=2x$
  3. $y=4x$
  4. $y=x+4$

Solution

Both points satisfy $y=2x$ ($0=2\cdot 0$ and $8=2\cdot 4$).

Asked in: IMO

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