Parallel, Perpendicular, or Neither???

Are the lines Parallel, Perpendicular, or neither: y = –5x + 9 and y = -5x –21

Are the lines parallel, perpendicular, neither: y = 3x - 2 and y = -3x + 5

Are the lines parallel, perpendicular, or neither: y = 1/2 x + 5 and y = -2x + 5

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