If $a$ and $b$ are the solutions to the equation $x^{2} - 5x + 9= 0$, what is the value of $(a - 1)(b - 1)$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $a$ and $b$ are the solutions to the equation $x^{2} - 5x + 9= 0$, what is the value of $(a - 1)(b - 1)$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
If $a$ and $b$ are the solutions to the equation $x^{2} - 5x + 9= 0$, what is the value of $(a - 1)(b - 1)$?
train