Question 635829: Suppose y varies directly with x, and y=36 when x=20. Find an equation of variation for x and y.
I need assistance with this problem thanks in advance.
Answer by KMST(5397)   (Show Source):
You can put this solution on YOUR website! In a direct variation,  equals  multiplied times a factor  :
That way, as doubles, doubles; as triples (or trebles, if you like that word better), triples (or trebles), and so on.
The ratio is the constant  <---> .
It's all a question of finding your constant.
In this case,
and for  ,  , so
 -->  --> 
So  .
If your teacher would rather have fractions than decimals,
 and  or 
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