# SOLUTION: How do I find all numbers for which the rational expression is undefined? For this rational expression -(18)/(11y). Please help I am confused!

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 Click here to see ALL problems on Sequences-and-series Question 515319: How do I find all numbers for which the rational expression is undefined? For this rational expression -(18)/(11y). Please help I am confused!Answer by oberobic(2304)   (Show Source): You can put this solution on YOUR website!You cannot divide by 0. Doing so is 'undefined'. . So any value of 'y' that would make the denominator = 0 cannot be allowed. . (18)/(11y) is undefined if . 11y = 0 . That only happens when y = 0 . So, 'y' can take on any value from -infinity to +infinity, except for 0. .