if lines are parallel or perpendicular 4x-8y=9 and 8x-7y=9

4x-8y=9 -8y=9-4x 8y=-9+4x y=0.5x-9/8 8x-7y=9 -7y=-8x+9 7y=8x-9 y=8/7x-9/7 neither, they aren't parallel or perpindicular. I tested by graphing them as well.