Plz help me. I am learning slope

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Which line is parallel to the line that passes through the points (2, –5) and (–4, 1) a. y=-x+5 b. y=-2/3x+3 c. y=2/3x-2 d. y=x+5