Two lines are perpendicular, and one of the lines has a slope of 4/5. Find the slope of the other line.

Question

Two lines are perpendicular, and one of the lines has a slope of 4/5.   Find the slope of the other line.

anonymous · Answer

tehir product is -1

anonymous · Answer

The definiton of perpenicular lines are that the slopes of the lines make a right angle with each other, and that they also have negative reciprocal slopes

anonymous · Answer

so slope of the other line is negative reciprocal of the first one if they areperpendicular

anonymous · Answer

That is to say that is one has a slope of $$\Large m$$

The perpendicular line is $$\Large {-1 \over m} $$

anonymous · Answer

so neagtive reciprocal of 4/5 is  -5/4

anonymous · Answer

so its -5/4

anonymous · Answer

what about this?

anonymous · Answer

If two lines are parallel and one line has a slope of -4/5, find the slope of the other line.

anonymous · Answer

4/5

anonymous · Answer

?

anonymous · Answer

-4/5

anonymous · Answer

parallel lines have same slopes

anonymous · Answer

so its -4/5 for the second one

anonymous · Answer

perpendicular lines' slopes are opposite reciprocals. so if the slope is 4/5 then the slope of the line perpendicular to it would be -5/4