Question 674036
y=-2x,2y=x,4y=2x+4

Line l, y=-2x,slope (m) = -2

line p, 2y=x,  slope (m) = 1/2

line n, 4y=2x+4  slope (m) = 1/2

line l is perpendicular line p & n

line p & line n are parallel

If the slopes are equal with different y intercepts then the lines are parallel.

if the product of the slopes is = -1 then the lines  are peripendicular.