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# intersecting lines

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Senior Manager
Joined: 02 Dec 2007
Posts: 463
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intersecting lines [#permalink]  14 Jun 2008, 23:21
Can anyone explain how to approach such questions?
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Director
Joined: 23 Sep 2007
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Re: intersecting lines [#permalink]  15 Jun 2008, 08:25
drawing lines is the fastest approach, it is difficult to explain this using numbers.
Senior Manager
Joined: 26 Mar 2008
Posts: 341
Location: Washington DC
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Re: intersecting lines [#permalink]  15 Jun 2008, 08:37
Using this information we can conclude-
Line 1 is on +ve XY plan, Hence +ve slope
and Line 2 is on -ve XY plan, Hence -ve slope

So products of their slope would -ve.
Manager
Joined: 22 May 2007
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Re: intersecting lines [#permalink]  15 Jun 2008, 09:48
Nihit,

The intercept form of the line

x/a+y/b = 1

where a=x-intercept
b= y-intercept

if you solve the above equation for y. In other words, put it in the form of y=mx+c where m is the slope
you will end up with m=b/a or y-intercept/x-intercept

Now going back to the DS, you will see that you will need both statements to solve the product of the slopes because the individual statements give you information on individual intercepts.

Does this help?
Senior Manager
Joined: 02 Dec 2007
Posts: 463
Followers: 2

Kudos [?]: 57 [0], given: 6

Re: intersecting lines [#permalink]  17 Jun 2008, 08:59
thanks guys !

P.S. Aaron yes it did help,many thanks
Re: intersecting lines   [#permalink] 17 Jun 2008, 08:59
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# intersecting lines

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