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If Y = 0 then there is no value of X such that XY = 1.
The answer depends on whether xy are commutative numbers or operators in a permutation group.
Yes, multiplying a Positive value by a Negative value always yields a Negative product.
Assuming the two equations are: 3xy - 3 = 0 ............................................. 1 2xy = 0 ............................................. 2 Then from eq 1 xy = 1 from eq 2 xy = 0 That is not possible. Or, assuming the equation is 3xy - 3 + 2xy = 0 Then 5xy = 3 or y = 3/5x Substitute for any value of x to get the value of y