answersLogoWhite

0


Best Answer

When the lines are horizontal and vertical. (slope of zero) (undefined slope)

User Avatar

Wiki User

14y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: When is the product of the slope of two perpendicular lines not equal to -1?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

For perpendicular lines if the slope of one line is -2 what is the slope of the line perpendicular to it?

For any two perpendicular lines (save a vertical and a horizontal one), the product of their slopes is always -1. For two perpendicular lines with one having a slope of -2, the other will have a slope equal to -1 divided by -2, which equals 1/2.


What is the slope of perpidicular lines?

When two lines are perpendicular to each other the product of their slopes is equal to -1.m1*m2 = -1


How do you use slope to determine if two lines are perpendicular?

You have to know the slopes of both lines. -- Take the two slopes. -- The lines are perpendicular if (one slope) = -1/(the other slope), or the product of the slopes equals to -1.


How do slopes of perpendicular lines compare?

Slopes of perpendicular lines will be opposite reciprocals. This means that the slopes have opposite signs and that one is 1/ the other. For example, 2 and -1/2.


If two lines are perpendicular what is the respective slopes equal to?

Given any line L, with slope m, the perpendicular line has slope -m.


What is the slope of perpendicular lines?

The slope of a perpendicular line is not defined.


Which formula is correct for the slopes of perpendicular lines?

if slope is given as m then perpendicular slope is -1/m (negative inverse)


What is does pendicular mean in maths?

Perpendicular, or "normal", means that two lines meet at right angles. The two lines cross in such a way that they form 4 equal angles between them.If you work with coordinates, the product of the slopes of two perpendicular lines are minus 1. For example, if a certain line has a slope of 2, another line, perpendicular to it, will have a slope of -1/2.


How do you determine if 2 lines are parallel perpendicular or neither?

Two lines are parallel if and only if they have the same slope. Two lines are perpendicular if the product of their slopes is -1. If neither of these conditions are met, the lines are nether parallel, or perpendicular.


What is the slope of a line that is perpendicular to a line with a slope of .33?

Perpendicular lines have slopes whose product is -1. As this is always true, if we think of .33 as about 1/3, then the perpendicular line would have a slope of -1/(1/3) which is -3.


Why the slope of x-axis and y-axis is not equal to -1 whereas slope of two perpendicular line is -1?

0


How can you determine if two lines are perpendicular?

If the angle formed between the intersecting lines are 90o then the two lines are perpendicular. In 2D coordinate geometry, a perpendicular line has a slope equal to the negative reciprocal of the original line.