Question 976194: I'm having trouble understanding how to write equations that relate x and y. For example, what equation am I supposed to write if x=4 and y=12. would it be 3x=y?
Found 2 solutions by oscargut, MathLover1:
Answer by oscargut(2103)   (Show Source):
Answer by MathLover1(20850)  (Show Source):
You can put this solution on YOUR website! we have:
Direct Variation
When two variables,  and  vary  , then
 where  is a constant called the "constant of proportionality."
When there is  variation between variables and ,  the value of will  result in being  . Also, if is cut in half, then is cut in half.
Inverse variation
When two variables, and vary  , then
or
or
where is a constant called the "constant of proportionality." When there is  variation between variables and , the value of will result in being
 in  . Also, if is cut in half, then is doubled.
in your example, if  and  then  => => => =>if and then the constant of proportionality is 
so, yes, it would be 
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