# How do you decide whether the relation #xy+7y=7# defines a function?

##### 1 Answer

Nov 9, 2015

You can rearrange the expression to find that

#### Explanation:

#7 = xy + 7y = (x+7)y#

Notice that if

If

#7/(x+7) = y#

That is:

#y = 7/(x+7)#

This uniquely determines the value of