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How do I simplify the rational expression -5x^3y / 15xy^3

I also have to state the restrictions on the variables

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Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
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-5x3y     -1*5*x*x*x*y        -1*5*x*x*x*y      -1*x*x       -x2
------   =   -------------------    =  ------------------  =  --------  =  -----
15xy3     3*5*x*y*y*y          3*5*x*y*y*y       3*y*y       3y2
 
x ≠ 0 and y ≠ 0 (because they both appear in the denominator of the original expression and we can't divide by 0)