Answer:
Neither.
Explanation:
Parallel equations have the same y-intercept. Perpendicular equations have negative reciprocal slopes.
First, turn x-y=9 into y-intercept form.
x-y-x=9-x
-y = 9 - x
(-y = 9 - x)-1
The equations are now
y = x-9 and
y= -5x+1
They don't share the same y-intercept nor do they have negative reciprocal slopes, so it's neither.