Geometry
posted by David .
Write an equation of the line that pass through point P and is parallel to the line with the given equation.
P(3,5); y=4

since y=4 is a horizontal line, you want a horizontal line that passes through P, where y=5.
Oops Spoiler alert!! 
Sorry, I meant to say perpendicular instead of parallel.

The actual question is :
Write an equation of the line that pass through point P and is perpendicular to the line with the given equation.
P(3,5); y=4 
well, what's the problem? A vertical line through P will have x=3. Cmon, guy, put on your thinking cap!