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# In the xy-plane, line k and line p intersect at 90-degree angles. If t

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Joined: 02 Sep 2009
Posts: 55802
In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

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29 Nov 2018, 01:09
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71% (00:22) correct 29% (01:10) wrong based on 39 sessions

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In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

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Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

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30 Nov 2018, 11:43
Bunuel wrote:
In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

for two lines which are perpendicular to each other i.e. intersect at 90 degree product of their slopes has to be equal to -1

so m1*1/2= -1
m1= -2 IMO A
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Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

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01 Dec 2018, 04:39
Bunuel wrote:
In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

the slopes of perpendecular lines are negative reciprocals of each other: m1*m2 = -1

So, $$m1*\frac{1}{2} =-1$$

$$M1 = -2$$
Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t   [#permalink] 01 Dec 2018, 04:39
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