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Line m passes through the origin. Line l is parallel to line

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Line m passes through the origin. Line l is parallel to line [#permalink] New post 18 Mar 2012, 20:38
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Line m passes through the origin. Line l is parallel to line m. What are the equations of the two lines?

(1) The horizontal distance between the two lines is 5 units.

(2) Line l has a y-intercept of 2.5

Last edited by Bunuel on 19 Mar 2012, 00:07, edited 2 times in total.
Edited the question.
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Re: DS Coordinate [#permalink] New post 18 Mar 2012, 22:50
Smita04 wrote:
Line m passes through the origin. Line l is parallel to line m. What are the equations of the two lines?

(1) The horizontal distance between the two lines is 5 units.

(2) Line l has a y-intercept of 2.5


Since the lines are parallel the slopes would be same, say m
Let the Line M be y=mx
So line L will be y=mx+c

Statement 1
Considering the horizontal distance on x axis , this distance can be taken towards +ve or -ve side of origin.
So the slopes of the lines and the value of c cannot be determined.
So insufficient.

Statement 2
Now we know the value of c but we still don't know the value of slope.
So insufficient.

From 1+2
We know that horizontal distance is 5 i.e x intercept and y intercept is 2.5 i.e c=2.5
Since the y intercept is +ve ,horizontal distance i.e x intercept is -ve.
So the line passes through (-5,0)
therefore using the equation we get
0=m(-5)+2.5
or m=1/2
So the equations are y=0.5x
and y=0.5x+2.5
So the answer is C
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Re: Line m passes through the origin. Line l is parallel to line [#permalink] New post 19 Mar 2012, 00:06
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Line m passes through the origin. Line l is parallel to line m. What are the equations of the two lines?

Equation of a line in point intercept form is \(y=mx+b\), where: \(m\) is the slope of the line and \(b\) is the y-intercept of the line (the value of \(y\) for \(x=0\)).

From the stem:
Since parallel lines have the same slope, then the slopes of l and m are the same;
Since a line passing through the origin has y-intercept equal to zero then the equation of line m would be \(y_m=mx\) and the equation of line l would be \(y_l=mx+b\)

(1) The horizontal distance between the two lines is 5 units --> basically we are told that the x-intercept of line l is either -5 or 5, so we know that line l passes either through the point (-5, 0) or (5, 0). Not sufficient.

(2) Line l has a y-intercept of 2.5 --> \(b=2.5\), so we know that line l passes through the point (0, 2.5). One point is not enough to determine (fix) a line. Not sufficient.

(1)+(2) Now, even take together we cannot determine whether line l passes through the point (-5, 0) or (5, 0). So, we would have two possible points of line l: (-5, 0) and (0, 2.5) OR (5, 0) and (0, 2.5), which means that we would have two possible equations of line l and m: \(y_l=0.5*x+2.5\) and \(y_m=0.5*x\) OR \(y_l=-0.5*x+2.5\) and \(y_m=-0.5*x\). Not sufficient.

Answer: E.

To demonstrate.
Case 1:
Attachment:
Case 1.png
Case 1.png [ 7.73 KiB | Viewed 4116 times ]

Case 2:
Attachment:
Case 2.png
Case 2.png [ 8.08 KiB | Viewed 4112 times ]

For more on this subject please check Coordinate Geometry chapter of Math Book: math-coordinate-geometry-87652.html

Hope it helps.
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Re: Line m passes through the origin. Line l is parallel to line [#permalink] New post 19 Mar 2012, 00:45
Thanx Bunuel
made a blunder mistake ...
there is lot to learn from you...
I will not delete my post so that others could learn from my mistake.
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Re: Line m passes through the origin. Line l is parallel to line [#permalink] New post 19 Mar 2012, 07:03
fantastic reply from Brunel....thanks
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Re: Line m passes through the origin. Line l is parallel to line [#permalink] New post 27 Jun 2013, 21:30
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Bumping for review and further discussion*. Get a kudos point for an alternative solution!

*New project from GMAT Club!!! Check HERE

Theory on Coordinate Geometry: math-coordinate-geometry-87652.html

All DS Coordinate Geometry Problems to practice: search.php?search_id=tag&tag_id=41
All PS Coordinate Geometry Problems to practice: search.php?search_id=tag&tag_id=62

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Re: Line m passes through the origin. Line l is parallel to line [#permalink] New post 25 May 2015, 02:44
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Re: Line m passes through the origin. Line l is parallel to line   [#permalink] 25 May 2015, 02:44
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