Answer:
C. 
Step-by-step explanation:
To find slope using coordinates, use the formula above.

Now, using the  formula, plug in
 formula, plug in  as
 as  (slope) and either coordinate as the
 (slope) and either coordinate as the  and
 and  values. It looks like this:
 values. It looks like this:

To solve for  , continue to use PEMDAS.
, continue to use PEMDAS.

Now use  and
 and  to solve for your equation:
 to solve for your equation:

 The answer is C.