If $y = x^2 - 7$ and $x$ is a real number, then what is the minimum value possible for $y$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $y = x^2 - 7$ and $x$ is a real number, then what is the minimum value possible for $y$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-7
If $y = x^2 - 7$ and $x$ is a real number, then what is the minimum value possible for $y$?
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