If $y^2= 36$, what is the greatest possible value of $y^3$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $y^2= 36$, what is the greatest possible value of $y^3$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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If $y^2= 36$, what is the greatest possible value of $y^3$?
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