Question 998806
Your description makes no sense.  Try again.  Maybe pick a well described example.


Variation can be either direct or inverse.  Usually a variable like k is chosen as a variation constant.


Using variables x and y, you MIGHT want to use how y is related to x.


y  varies directly with x.
This can be translated, {{{highlight(y=kx)}}}.  If given a set of x & y values, you can find the value for k.
{{{y/x=kx/x}}}
{{{highlight_green(y/x=k)}}}


y varies inversely with x.
The translation can be,  {{{highlight(y=k/x)}}}.  If given a set of x & y values, you can find the value for k.
{{{y*x=(k/x)*x}}}
{{{highlight_green(yx=k)}}}


Be aware that sometimes alternative wording is used, but you become accustomed to interpreting it.
The word, "jointly" may be used in place of "directly".