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In the xy-plane, if line k has negative slope and passes

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Re: In the xy-plane, if line k has negative slope and passes [#permalink] New post 04 Mar 2013, 03:38
slope and algebraic

I want to follow this posting.

this type of hard question appear in gmatprep but dose not appear in og.
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Director
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Joined: 08 Jun 2010
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Kudos [?]: 39 [0], given: 89

Re: In the xy-plane, if line k has negative slope and passes [#permalink] New post 04 Mar 2013, 03:47
this type of question appear infrequently and so become hard questions.

never use drawings. use algebraic
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Re: In the xy-plane, if line k has negative slope and passes [#permalink] New post 06 Jun 2013, 23:43
GMATMadeeasy wrote:
In the xy-plane, if line k has negative slope and passes through the point (-5,r) , is the x-intercept of line k positive?

(1) The slope of line k is -5.
(2) r > 0


the answer is E only because : as per your assumption you took x intercept as x.but it can also be negative try it with -x we cannot determine the sign of x intercept.if x intercept is (-x,0) then slope m=r-0/-5+x.
and x=r+5m/m..
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Re: In the xy-plane, if line k has negative slope and passes [#permalink] New post 05 Dec 2014, 22:09
(1) the slope of line k is -5 => we know for each unit of "run" the line should have 5 units of "fall" => the x-intercept to be positive we should have r>25 but here the value of r is not clear => insufficient.
(2) r>0, same as (1) the value of r is not clear also we don't know the slope => insufficient.
(1) & (2): we know the slope is -5 and r>0 but r can be greater than 25 or less than it. => insufficient.
Re: In the xy-plane, if line k has negative slope and passes   [#permalink] 05 Dec 2014, 22:09

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