SOLUTION: what are the numbers for which the rational expression is undefined? 22/-9y

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Question 323019: what are the numbers for which the rational expression is undefined? 22/-9y
Answer by QH(50) About Me  (Show Source):
You can put this solution on YOUR website!
To make something 'undefined', the easy way to think about it is "what numbers will put a zero in the denominator", as anything divided by zero is undefined.
So what number(s) multiplied by -9 = 0?
You know immediately the answer is 0, but for more complex denominators or if you have to show work...
Set the denominator equal to zero
-9y=0
%28-9y%29%2F-9=0%2F-9
y=0