I haven't done these equations since my 8th grade year and I'm just trying to refresh my memory.lol and I need some help.

parallel lines have the same slop; perpendicular lines have slopes which are the negative inverse of each other, ie, when multiplied together the result is -1.

slope of y=3x+8 is 3

slope of y=-3x+4 is -3

The two lines are neither parallel nor perpendicular.