Answer:
If the answer is more flexible, I would say all the y's are parallel, and all the x's are parallel. But when you compare the y's and x's, they would become perpendicular.
Explanation:
If the coordinate just says y=-5, that means start at the origin (0,0) and move down five. Then graph the line...When the coordinate is y, the line is horizontal. And in the situation where it's x=-4, the same principle should be applied. The only difference is when you move to that coordinate, the line would be vertical instead of horizontal. Hopefully this makes sense. If not, let me know. :)