Answer
neither.
Work Step by Step
First, solve for y with both lines:
y = 2x - 6 (already solved for y) and
-4x = 2y
-2x=y
The slope of the form y =mx+b is always m, so in the line y=2x-6, we have slope 2.
Similarly, the slope of the second line is -2.
Since both slopes are not the same, they are not parallel.
Since one slope is not the negative reciprocal of the other (1/2), the answer has to be neither.