is each line parallel, perpendicular, or neither parallel or perpendicular to a line whose slops is -3/4?

Line m, with slips 3/4
Line n, with slope 4/3
Line p, with slope -4/3
Line q, with slope -3/4

I did this on graph paper and they all seem parallel and I know they all can’t be so I’m kind of second guessing help please hahah. I need to know which one is parallel. Perpendicular. Or neither. Thank you