$y$ varies directly as $x$. When $x$ becomes $3$ times its value, $y$ becomes:

$y$ varies directly as $x$. When $x$ becomes $3$ times its value, $y$ becomes:
  1. $\dfrac{1}{3}$ times its value
  2. $3$ times its value
  3. $9$ times its value
  4. Unchanged

Solution

If $y = k x$, then multiplying $x$ by $3$ multiplies $y$ by $3$.

Asked in: IMO

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