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Determine which of the lines, if any, are parallel or perpendicular.
Line a:y+4=1/2x
; Line b: 2y=-4x+6; Line c: y=2x-1
Lines a and b are parallel.
Lines a and b are perpendicular.
Lines a and care parallel.
Lines a and care perpendicular.
Lines b and care parallel
Lines b and care perpendicular