Answer: [tex]b \le -7[/tex] which means b is less than or equal to -7
In other words, b can be -7 or it can be smaller (-8, -9, -10, etc)
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To get this answer, you simply subtract 9 from both sides. On the left side, the 9+b or b+9 will turn into b+0 or just b. On the right side, you'll have 2-9 turn into -7. This shows how [tex]9+b \le 2[/tex] becomes [tex]b \le -7[/tex]
Note: to graph this on a number line, you would plot a closed circle at -7, then shade to the left of the closed circle. The closed circle means "include -7 as part of the solution set".
