are these parallel, perpendicular, or neither?

y=-3x-4 and y=3x-11
y=3x-4 and y=3x-11
y=(-2/3)x-4 and y=(3/2)x-11

perpendicular: negative reciprocal

parallel: same slope
neither: other slope

first: neither
second same slope, parallel
third: neg reciprocal, perpendicular

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