Answer:
29 because lines ac and bd are perpendcular and equal.
Step-by-step explanation:
im not fully sure my explanation is good enough
Solution:

Answer:

<em>Hope this was helpful.</em>
<span>(1/2) [SIN(X-Y)-SIN(X+Y)]= COS(X)SIN(Y)</span>
Answer:
Slope(m)=-1
Step-by-step explanation:
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