Question 6532
In terms of maths we have y {{{alpha}}} {{{1/x}}} or converting to an equation, {{{y = k/x}}} where k is the constant of proportionality. Now we need to find the value of k. For this we need to know y and x, which we do from the question. So put the values into the equation to find k.

{{{k/4=8}}}
{{{k=32}}}

So the equation is now: {{{y = 32/x}}}. You can now do the final part: "find y when x=16".

{{{y = 32/16}}}
{{{y = 2}}}

Hope that helps.
Regards,
-Mike