Ans: A
Consider $y=x-9$. Note that the slope is $1$, which is positive and the $y$ intercept is $-9$. Therefore A or B may be the correct answer. Sub. $O(0,0)$ into the left side and right side of $y=x-9$, we have
Consider $y=x-9$. Note that the slope is $1$, which is positive and the $y$ intercept is $-9$. Therefore A or B may be the correct answer. Sub. $O(0,0)$ into the left side and right side of $y=x-9$, we have
$\begin{array}{rcl}
\text{LS} & = & 0 \\
\text{RS} & = & (0) – 9 \\
& = & -9
\end{array}$
Therefore, $\text{LS} \ge \text{RS}$. Therefore, $O(0,0)$ is not a solution of $y \le x – 9$. Hence, A is the correct answer.
