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Can someone explain this/help me figure this out?

--------------------------------- Find the slope of a line that is perpendicular to the line containing the points (-2, -1) and (2,-3). -------------

If someone could help me with this, I would be so thankful. Thanks.
 Jan 17, 2014
 #1
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Alright so take some graph paper, or go here: https://www.desmos.com/calculator then draw a line so that it makes a perfect T with the line that you drew. Use your knowledge of how to write out the equation of a line and you can just plug in a few points on the line to name your equation of a line.
 Jan 17, 2014
 #2
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DJ-7809:

Alright so take some graph paper, or go here: https://www.desmos.com/calculator then draw a line so that it makes a perfect T with the line that you drew. Use your knowledge of how to write out the equation of a line and you can just plug in a few points on the line to name your equation of a line.



I think it would be more effective to do it the manual way, but thanks anyways.
 Jan 17, 2014
 #3
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--------------------------------- Find the slope of a line that is perpendicular to the line containing the points (-2, -1) and (2,-3). -------------


Thank you for your answer DJ-7809.

Hi LAPAPALLAJD,

I will try to explain how to do it manually.
---------------------------------------------------------------------------------------------
No, changed my mind, I will give you a different question and then you can do this one by yourself

Find the line that is perpendicular to (-8,3) and ( -1,-5)

gradient = rise / run = (-5-3) / (-1--8) => -8 / (-1+8) => -8 / 7

The gradient (slope) of the perpendicular line is the negative reciprocal that is = +7 / 8

Over to you.
 Jan 18, 2014

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