Question 178478
Simplify the expression and identify values for which the expression is undefined......

((2/y)-1)/((3/x)+1) 


I think that the undefined values for x are -3 and 0 and for y is 0 since those values would cause a denominator to become 0.
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The undefined value for x is 0; the undefined value for y is 0.
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Simplifying:

= [(2-y)/y] / [(3+x)/x]

Invert the denominator and multiply to get:

[(2-y)/y] * [x/(3+x)]

= [x(2-y)]/[y(3+x)]

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Cheers,
Stan H.