Question 93430
You can write this relationship (formula) as:
{{{x = k/y}}} x varies inversely (upsidedownwardly ?) as y which really means that if y goes up then x goes down and vice versa.  The k is called the proportionality constant.
We need to determine the value of k.  This can be done with the help of the given information that x = 2 when y = 8.  Substituting these values into the above equation allows us to solve for k.
{{{2 = k/8}}} Multiply both sides by 8.
{{{2(8) = k}}} so...
{{{k = 16}}}
Now our formula looks like this:
{{{x = 16/y}}}
Now we are ready to answer the question: What is x when y = 15.
{{{x = 16/15}}}
{{{x = 1.067}}}