F FMMurphy Junior Member Joined Mar 12, 2006 Messages 51 Sep 18, 2006 #1 Would the slope of all lines perpendicular to y= -5/2 x be 2/5? The definition says that lines are perpendicular if and only if their slopes are negative recipricals of each other.

Would the slope of all lines perpendicular to y= -5/2 x be 2/5? The definition says that lines are perpendicular if and only if their slopes are negative recipricals of each other.

tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 10,030 Sep 18, 2006 #2 Another way to say that: Multipy them and you'll get -1 Slope -5/2 Perpendicular Slope +2/5 Multiply them (-5/2)*(2/5) = -10/10 = -1 -- Yup.

Another way to say that: Multipy them and you'll get -1 Slope -5/2 Perpendicular Slope +2/5 Multiply them (-5/2)*(2/5) = -10/10 = -1 -- Yup.