Which pair of equations would represent lines that are PERPENDICULAR to each other?

Question

I.
3
x
−
2
y
=
12

II.
3
x
+
2
y
=
−
12

III.
2
x
−
3
y
=
−
12

I and II

I and II

II and III

II and III

I and III

I and III

None of these lines are perpendicular to each other.

Answer 1

II & III