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# In a rectangular coordinate system, which of the following

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Manager
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In a rectangular coordinate system, which of the following [#permalink]  20 Oct 2010, 01:55
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65% (02:39) correct 35% (01:48) wrong based on 161 sessions
In a rectangular coordinate system, which of the following points is intersected by the line connected by the coordinates (5,6) and (21,18)?

A. (9,9)
B. (12,12)
C. (13,13)
D. (12,13)
E. (16,15)
[Reveal] Spoiler: OA

Last edited by Bunuel on 22 Sep 2012, 09:03, edited 1 time in total.
Edited the question.
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Re: In a rectangular coordinate system ............ [#permalink]  20 Oct 2010, 02:05
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Expert's post
pzazz12 wrote:
In a rectangular coordinate system ,which of the following points is intersected by the line connected by the coordinates (5,6) and(21,18)?
A.(9,9)
B.(12,12)
C.(13,13)
D.(12,13)
E.(16,15)

The slope of a line passing through the points (5,6) and (21,18) is "rise over run": $$\frac{18-6}{21-5}=\frac{3}{4}$$.

The slope of a line passing through the point (5,6) and one of the points from the answer choice must also be $$\frac{3}{4}$$ (as it's the same lin), so $$\frac{y-6}{x-5}=\frac{3}{4}$$.

Answer choice A works: $$\frac{9-6}{9-5}=\frac{3}{4}$$.

For more on these issues check Coordinate Geometry chapter of Math Book: math-coordinate-geometry-87652.html

Hope it helps.
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Re: In a rectangular coordinate system ............ [#permalink]  20 Oct 2010, 02:15
pzazz12 wrote:
In a rectangular coordinate system ,which of the following points is intersected by the line connected by the coordinates (5,6) and(21,18)?
A.(9,9)
B.(12,12)
C.(13,13)
D.(12,13)
E.(16,15)

Equation of the line connecting the two points,(5,6) and (21,18);

y-6= {(6-18)/(5-21)}(x-5) or , 4y-3x=9

Only ( 9,9) is satisfying the equation.Hence answer is A.

Consider KUDOS if its helpful to u .Thanks.
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Re: In a rectangular coordinate system, which of the following [#permalink]  14 Aug 2013, 02:44
Expert's post
Bumping for review and further discussion.
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Re: In a rectangular coordinate system, which of the following [#permalink]  30 Dec 2014, 21:26
I think option D also satisfy equation then why only option A is selected?
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Re: In a rectangular coordinate system, which of the following [#permalink]  31 Dec 2014, 02:55
Expert's post
saurabhk99 wrote:
I think option D also satisfy equation then why only option A is selected?

How does D fit? Show your work.
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In a rectangular coordinate system, which of the following [#permalink]  31 Dec 2014, 09:24
I found the equation of the line to be $$y = \frac{3x}{4} + \frac{9}{4}.$$. Then, noticing that 3 of the options had the same value for x and y, I wanted to check at which point on the line the x and y values were equal. So I solved for x:

$$x = \frac{3x}{4} + \frac{9}{4}$$
$$\frac{x}{4} = \frac{9}{4}.$$
$$x = 9.$$

Therefore, (9,9) is a point on the line and our answer is A.

Further: If we would have found some other value (one that wasn't listed on the answer choices) then we at least could have eliminated 3 of the answer choices and then manually checked the other two.
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Re: In a rectangular coordinate system, which of the following [#permalink]  31 Dec 2014, 16:10
made mistake in calculation....agree A is the right one
Re: In a rectangular coordinate system, which of the following   [#permalink] 31 Dec 2014, 16:10
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