A line goes through point $A(9, 1)$, point $B(19, k)$ and point $C(7, 0)$. What is the value of $k$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A line goes through point $A(9, 1)$, point $B(19, k)$ and point $C(7, 0)$. What is the value of $k$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6
A line goes through point $A(9, 1)$, point $B(19, k)$ and point $C(7, 0)$. What is the value of $k$?
train