Math question for class

Question

2).Determine whether the two lines are parrallel, perpendicular or neither 

x-3y=6

y=3x+4

Answer 1

neither

2nd has slope = 3

1st has slope = 1/3

to be parallel they both need to have the same slope

to be perpendicular they need to have negative inverse slopes

3 and 1/3 are inverses, but not negative inverses