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#1 2007-01-22 03:39:54

jxharmon
Member
Registered: 2007-01-08
Posts: 104

finding slope of any line perpendicular

slope of any line perpendicular through points (0,5) and (-3,-4)

m= 5-(-4)/0-(-3)=9/3=3

am I doing this right

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#2 2007-01-22 03:43:26

luca-deltodesco
Member
Registered: 2006-05-05
Posts: 1,470

Re: finding slope of any line perpendicular

the slope of a line is dy/dx (change in y / change in x)

so we would have

m = [ 5 - (-4) ] / [ 0 - (-3) ] = 9 / 3 = 3, so yes correct, although you need brackets around the first division.

two lines are perpendicular, when the the product of their slopes is -1

m[sub]1[/sub]m[sub]2[/sub] = -1
m[sub]2[/sub] = -1 / m[sub]1[/sub] = -1/3

Last edited by luca-deltodesco (2007-01-22 03:43:54)


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