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M28-17

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M28-17  [#permalink]

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New post 16 Sep 2014, 01:29
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

71% (01:30) correct 29% (01:34) wrong based on 117 sessions

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Re M28-17  [#permalink]

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New post 16 Sep 2014, 01:29
Official Solution:

The distance from the Y-axis to point K is \(\frac{1}{3}\) of the distance from the X-axis to point K. If the coordinates of K are (-3, y), what is the distance between point K and X-axis?

A. \(\frac{1}{2}\)
B. \(1\)
C. \(3\)
D. \(4.5\)
E. \(9\)


Point K has the coordinates (-3, y) means that it's somewhere on the line \(x=-3\). Hence the distance from this point to the Y-axis is 3 units.

Since the distance from the Y-axis to point K is \(\frac{1}{3}\) of the distance from the X-axis to point K, then the distance from K to the X-axis is 9 units.


Answer: E
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Re: M28-17  [#permalink]

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New post 31 Mar 2017, 23:25
brunel : By inferring the point is on the line x = -3, how were you able to determine the distance from y axis is 3 units ?
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Re: M28-17  [#permalink]

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New post 01 Apr 2017, 06:14
varunjoshi31 wrote:
brunel : By inferring the point is on the line x = -3, how were you able to determine the distance from y axis is 3 units ?


Check the image below:
Attachment:
Untitled.png


x = -3 is a line parallel to y-axis. Any point on x = -3 is 3 units apart from y -axis.

Hope it's clear.
>> !!!

You do not have the required permissions to view the files attached to this post.


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Re: M28-17  [#permalink]

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New post 31 Oct 2018, 08:15
Bunuel wrote:
varunjoshi31 wrote:
brunel : By inferring the point is on the line x = -3, how were you able to determine the distance from y axis is 3 units ?


Check the image below:
Attachment:
Untitled.png


x = -3 is a line parallel to y-axis. Any point on x = -3 is 3 units apart from y -axis.

Hope it's clear.



Hi Bunuel.... although its not there in the answer...... can it be -9 ?
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Re: M28-17  [#permalink]

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New post 31 Oct 2018, 08:41
Bunuel could you please explain below ask:
distance from the Y-axis to point K is 1313 of the distance from the X-axis to point K, then the distance from K to the X-axis is 9 units.How we get 9 units from there?
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Re: M28-17  [#permalink]

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New post 10 Nov 2018, 04:00
u1983 wrote:
Bunuel wrote:
varunjoshi31 wrote:
brunel : By inferring the point is on the line x = -3, how were you able to determine the distance from y axis is 3 units ?


Check the image below:
Attachment:
Untitled.png


x = -3 is a line parallel to y-axis. Any point on x = -3 is 3 units apart from y -axis.

Hope it's clear.



Hi Bunuel.... although its not there in the answer...... can it be -9 ?


Distance is always absolute value so cant be negative
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Re: M28-17  [#permalink]

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New post 03 Dec 2018, 07:18
Brilliant solution. I was calculating distance between 2 points, and solving for y.
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Re M28-17  [#permalink]

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New post 05 Mar 2019, 07:16
I think this is a high-quality question and I agree with explanation. It would be a nice trap to add -9 as an answer.
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Re M28-17   [#permalink] 05 Mar 2019, 07:16
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