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

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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]  23 Jul 2008, 07:36
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?
Senior Manager
Joined: 06 Apr 2008
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Re: intercept of the line K positive? [#permalink]  23 Jul 2008, 07:58
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?

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
Joined: 19 Jul 2008
Posts: 25
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Kudos [?]: 2 [0], given: 0

Re: intercept of the line K positive? [#permalink]  23 Jul 2008, 09:01
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?

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
Joined: 06 Apr 2008
Posts: 450
Followers: 1

Kudos [?]: 69 [0], given: 1

Re: intercept of the line K positive? [#permalink]  23 Jul 2008, 09:11
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?

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, 09:11
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