SOLUTION: why is 0 the restricted value for the y= 3 - x / x rational expression or function?

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Question 293519: why is 0 the restricted value for the y= 3 - x / x rational expression or function?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
The denominator cannot equal zero since division by zero is undefined.