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In xy-coordinate plane, the slope of line L is 3/4. Does lin

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In xy-coordinate plane, the slope of line L is 3/4. Does lin [#permalink] New post 23 Apr 2013, 00:07
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In xy-coordinate plane, the slope of line L is 3/4. Does line L pass through point (-2/3, 1/2)?

(1) Line L passes through (4 ,4)
(2) Line L passes through (-4, -2)
[Reveal] Spoiler: OA

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Last edited by mau5 on 01 Aug 2013, 01:27, edited 2 times in total.
Renamed the topic and edited the question.Edited Typo.
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Re: Coordinate geometry [#permalink] New post 23 Apr 2013, 02:08
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kabilank87 wrote:
In the XY - coordinate plane the slope of a line L is 3/4. Does the line L pass through point (-2/3 , 1/2 )

1, Line L pass through point (4,4)
2. Line L pass through point (-4,-2)


NO need to calculate anything. If you know two points on a line, you can calculate the unique slope for that line. From both the Fact statements, we can arrive at a unique slope and answer the Question Stem.

D.
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Re: Coordinate geometry [#permalink] New post 23 Apr 2013, 02:38
vinaymimani wrote:
kabilank87 wrote:
In the XY - coordinate plane the slope of a line L is 3/4. Does the line L pass through point (-2/3 , 1/2 )

1, Line L pass through point (4,4)
2. Line L pass through point (-4,-2)


NO need to calculate anything. If you know two points on a line, you can calculate the unique slope for that line. From both the Fact statements, we can arrive at a unique slope and answer the Question Stem.

D.


Hi Vinay,

Will you please explain with formulas or steps ?

Thanks in advance.
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Re: Coordinate geometry [#permalink] New post 23 Apr 2013, 02:53
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let the line be: y=mx+c

where m is the slope and c is the y intercept.

so y=(3/4)x+c

Statement 1:
if the line passes through 4,4 then 4=(3/4) 4 + c.. That implies c = 1. hence the equation of the line is y=(3/4)x+1. Now you can find whether line passes through -2/3,1/2

Similarly for statement 2.

You don't need to calculate all of this. You need to tell whether the statement is 'sufficient' to get an answer. in general, when the slope and a point is given you can find the equation of the line. Therefore, you can find whether any random point lies on that line or not.

Hence D.
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Re: Coordinate geometry [#permalink] New post 23 Apr 2013, 02:56
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Quote:

Hi Vinay,

Will you please explain with formulas or steps ?

Thanks in advance.


If two unique points (x,y) and (p,q) are given for a line,the slope of this line = (q-y)/(p-x) or (y-q)/(x-p).

From F.S 1, we know that line passes through (4,4). Assume that it does pass through (-2/3,1/2). Then, the slope of the line has to be 3/4. Now the slope = (4-1/2)/[4-(-2/3)] = (7/2)/(14/3) = 3/4. Thus, it indeed passes through (-2/3,1/2). Sufficient.

From F.S 2, similarly, the slope = (-2-1/2)/[-4-(-2/3)] = (-5/2)/(-10/3) = 3/4. Thus, it passes through the given point. Sufficient.
Note that in case the slope didn't turn out to be 3/4, we would STILL be able to answer the question stem, with a YES or a NO.

D.
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Re: In xy-coordinate plane, the slope of line L is 3/4. Does lin [#permalink] New post 24 Apr 2013, 17:17
Equation of the line can be formed by using the slope and a point using the slope-point form of the line equation. Both A and B provides for the point needed to get the equation. Using equation of line we can check for the required condition. D wins.
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Re: In xy-coordinate plane, the slope of line L is 3/4. Does lin [#permalink] New post 01 Aug 2013, 01:19
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kabilank87 wrote:
In xy-coordinate plane, the slope of line L is 3/4. Does line L pass through point (-2/3, 1/2)?

(1) Line L passes through (-4 ,4)
(2) Line L passes through (-4, -2)


Please note statement 1 has been changed from (4,4 ) to (-4, 4)

Well (-4,4) means line L does not pass through point (-2/3, 1/2)
so both the statements will contradict each other.

if statement 1 can be edited to the original format ( 4,4) that could help.
Thanks
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Re: In xy-coordinate plane, the slope of line L is 3/4. Does lin [#permalink] New post 01 Aug 2013, 01:28
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stne wrote:
kabilank87 wrote:
In xy-coordinate plane, the slope of line L is 3/4. Does line L pass through point (-2/3, 1/2)?

(1) Line L passes through (-4 ,4)
(2) Line L passes through (-4, -2)


Please note statement 1 has been changed from (4,4 ) to (-4, 4)

Well (-4,4) means line L does not pass through point (-2/3, 1/2)
so both the statements will contradict each other.

if statement 1 can be edited to the original format ( 4,4) that could help.
Thanks


Thanks for noticing.
+1.
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Re: In xy-coordinate plane, the slope of line L is 3/4. Does lin   [#permalink] 01 Aug 2013, 01:28
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