How do we use inverse variation?

So how does an inverse variation problem look like?
Like this -->                              

x	y
3	20
6	10
12	y

Well call this problem an inverse variation relationship. We say that the X value varies inversely with the Y value. In simpler words, as the X value goes up, the Y value goes down and vise-versa. 

In order to solve this problem, you can use the following equation:  

REMEMBER: An inverse variation will always have a constant value --> K.

K will be the product of the X and Y values.

So for our little equation: 3*20=60 and 6*10=60, so our constant (k) must be 60.

Now let's plug in all the values:  y=60

                                     12

So the missing Y value must be 5! 

Yay, we are finished with this problem. It's really simple!