neither
They are parallel lines.
parallel
The lines are parallel, but not the same.
They are parallel.
They are parallel lines with a vertical separation of 1.
They are parallel lines.
They are straight lines.
They are parallel lines.
parallel
If: 12 = 2y+x then y = -1/2x+6 So: y = 2x+4 and y = -1/2x+6 which means that they are perpendicular lines
They are parallel lines
The lines are parallel, but not the same.
parallel
They are parallel.
They are parallel lines with a vertical separation of 1.
It is not one, but they are two perpendicular lines.
The lines are mutually perpendicular.