# SOLUTION: Determine which two equations represent perpendicular lines. a)y=4/9x-3 b)y=3x-4/9 c)y=-1/3x+4/9 d)y=1/3x-4/9 Can someone please help me out? Jess

Algebra ->  Algebra  -> Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: Determine which two equations represent perpendicular lines. a)y=4/9x-3 b)y=3x-4/9 c)y=-1/3x+4/9 d)y=1/3x-4/9 Can someone please help me out? Jess      Log On

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 Question 148188: Determine which two equations represent perpendicular lines. a)y=4/9x-3 b)y=3x-4/9 c)y=-1/3x+4/9 d)y=1/3x-4/9 Can someone please help me out? JessAnswer by mangopeeler07(462)   (Show Source): You can put this solution on YOUR website!answer: b and c b)y=3x-4/9 c)y=-1/3x+4/9 Why? because their slopes are negative reciprocals of each other. Slopes-- 3x and -1/3x. 3x reciprocal: 1/3x negative: -1/3x -1/3x reciprocal: -3x negative: 3x If the slopes are negative reciprocals of each other, then the lines are perpendicular. Always.