-3
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Two real numbers $x$ and $y$ satisfy $x-y=4$ and $x^3-y^3=28$.  Compute $xy$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-3
Two real numbers $x$ and $y$ satisfy $x-y=4$ and $x^3-y^3=28$.  Compute $xy$.
train