For this case we have to by definition, if two lines are perpendicular then the product of its slopes is -1.
That is to say:

We have the following equation:

So:

Thus:

Thus, a line perpendicular to the given line must have slope 
Option A:

It is not perpendicular!
Option B:

If it is perpendicular!
Option C:

It is not perpendicular!
Option D:

It is not perpendicular!
The correct option is option B
ANswer:
Option B
Answer:
Marco's boxes weigh 15 lbs.
Step-by-step explanation:
9x + 14(x - 8) = 233
9x + 14x - 112 = 233
23x = 345
x = 15