On a line graph, $y=2x+1$ passes through which of the following points?

On a line graph, $y=2x+1$ passes through which of the following points?
  1. $(0,0)$
  2. $(1,3)$
  3. $(2,4)$
  4. $(3,5)$

Solution

Substitute $x=1$: $y = 2(1)+1 = 3$. So the point $(1,3)$ lies on the line.

Asked in: IMO

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