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In the xy plane , if line K has -ve slope and passes through

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Intern
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Joined: 19 Jul 2008
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In the xy plane , if line K has -ve slope and passes through [#permalink]

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New post 23 Jul 2008, 08:36
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In the xy plane , if line K has -ve slope and passes through the point (-5,r) , Is the intercept of the line K positive ?

a) The slope of line K is -5.
b) r> 0

Do we have to find the y-intercept or the x-intercept since nothing is explicitly cited?
Please help to solve.
Senior Manager
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Re: intercept of the line K positive? [#permalink]

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New post 23 Jul 2008, 08:58
gmatcraze wrote:
In the xy plane , if line K has -ve slope and passes through the point (-5,r) , Is the intercept of the line K positive ?

a) The slope of line K is -5.
b) r> 0

Do we have to find the y-intercept or the x-intercept since nothing is explicitly cited?
Please help to solve.


Answer is E)

Combining both the y-intercept will be some point (0, y)

y -r / 0 - (-5) = -5 => y = r - 25

so even if r>0 y can be +ve or -ve
Intern
Intern
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Joined: 19 Jul 2008
Posts: 24
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Kudos [?]: 8 [0], given: 0

Re: intercept of the line K positive? [#permalink]

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New post 23 Jul 2008, 10:01
nmohindru wrote:
gmatcraze wrote:
In the xy plane , if line K has -ve slope and passes through the point (-5,r) , Is the intercept of the line K positive ?

a) The slope of line K is -5.
b) r> 0

Do we have to find the y-intercept or the x-intercept since nothing is explicitly cited?
Please help to solve.


Answer is E)

Combining both the y-intercept will be some point (0, y)

y -r / 0 - (-5) = -5 => y = r - 25

so even if r>0 y can be +ve or -ve


How do we know whether we need to find the y-intercep or the x-intercept? Please helpt to clarify .... Thanks
Senior Manager
Senior Manager
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Joined: 06 Apr 2008
Posts: 449
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Kudos [?]: 124 [0], given: 1

Re: intercept of the line K positive? [#permalink]

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New post 23 Jul 2008, 10:11
gmatcraze wrote:
nmohindru wrote:
gmatcraze wrote:
In the xy plane , if line K has -ve slope and passes through the point (-5,r) , Is the intercept of the line K positive ?

a) The slope of line K is -5.
b) r> 0

Do we have to find the y-intercept or the x-intercept since nothing is explicitly cited?
Please help to solve.


Answer is E)

Combining both the y-intercept will be some point (0, y)

y -r / 0 - (-5) = -5 => y = r - 25

so even if r>0 y can be +ve or -ve


How do we know whether we need to find the y-intercep or the x-intercept? Please helpt to clarify .... Thanks


Generally slope is referred alongwith y intercept only from eq y = mx + c.
Re: intercept of the line K positive?   [#permalink] 23 Jul 2008, 10:11
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In the xy plane , if line K has -ve slope and passes through

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