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

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

To solve for 
, continue to use PEMDAS.

Now use 
 and 
 to solve for your equation:

 The answer is C.