They are straight lines. They are positively inclined. They have the same gradient.
Without an equality sign it is not an equation
They are parallel lines.
They are parallel lines with a vertical separation of 1.
Perpendiculat straight lines.
neither
They are parallel lines
Without an equality sign it is not an equation
They are parallel straight lines,
They are parallel lines.
They are parallel lines.
They are parallel lines with a vertical separation of 1.
They are straight lines.
Perpendiculat straight lines.
parallel
neither
parallel
perpendicular