Answer:
its c
Step-by-step explanation:
What is the ribbon thing for?
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
Y is 9 because 2 times 5 is 10, then you take that same 10 and subtract 1 and then you have 9
Answer:
7
Step-by-step explanation: