Question

Determine whether the graphs of the given equations are​ parallel, perpendicular, or neither.
y=−4
x=9
Choose the correct answer below.
A.
Neither
B.
Parallel
C.
Perpendicular

Answer 1

C. Perpendicular. The slope of
y
=
−
4
y
=
-
4
is
0
0
and the slope of
x
=
9
x
=
9
is undefined. The line with undefined slope is vertical and the line with zero slope is horizontal.