Answer: Neither
Reason
The slopes of the linear equations are 2 and -2. To find the slope, use the template y = mx+b
m = slope
b = y intercept
Since the slopes aren't equal, the lines aren't parallel. Parallel lines have equal slopes but different y intercepts.
Since the slopes do not multiply to -1, the lines aren't perpendicular. An example of two perpendicular slopes would be 2/3 and -3/2. One slope is the negative reciprocal of the other.