A line $\ell$ passes through the points $B(7,-1)$ and $C(-1,7)$.  The equation of this line can be written in the form $y=mx+b$; compute $m+b$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A line $\ell$ passes through the points $B(7,-1)$ and $C(-1,7)$.  The equation of this line can be written in the form $y=mx+b$; compute $m+b$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
A line $\ell$ passes through the points $B(7,-1)$ and $C(-1,7)$.  The equation of this line can be written in the form $y=mx+b$; compute $m+b$.
train