Which two lines are perpendicular?

A
2x−6y=−12

and

3x−y=−5

B
6x−15y=−60

and

2x−5y=10

C
2x+5y=7

and

−6x−15y=−21

D
y=2

and

2x−3y=10

E
2x−3y=12

and

3x+2y=10