Tale of 2 Sisters

Ravine is a engineer for the Northern Cartesian Train Line. She travels on a track that has a slope of 4 and passes through the point (5,8).
What is the equation of the line she travels on?

Suzette is a mason. She is building a wall that has a slope of 2 and passes though the point (2,2).
What is the equation of the slope of the wall?