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Line p passes through points (-1, 2) and (-3, -4). What is the slope of a line perpendicular to p

 Oct 2, 2020
 #1
avatar+232 
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First find the slope:

Change in y = 2 - (-4) = 6

Change in x = -1 - (-3) = 2

Remember to subtract in the correct order... if you use y- y2, then you have to do x- x2.

Another note, the order in which you subtract (y- yor y- y1) does not matter.

The slope: 6/2 = 3

To find a parallel slope, you need to remember that it's negative, then reciprocal. In this case:

3 => -3 => -1/3

 Oct 2, 2020
 #2
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To find a perpindicular slope, you need to remember that it's negative, then reciprocal. In this case:

3 => -3 => -1/3

 

*** typo fixed ***

 Oct 2, 2020
 #3
avatar+232 
+1

still incorrect. its "perpendicular"

Weiart000  Oct 4, 2020

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