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sana.noor: Legendary Member; Posts: 512; Joined: Mon Jun 18, 2012 11:31 pmFollowed by: 20 members; Thanked: 42 times

by sana.noor » Wed Jul 17, 2013 1:16 am

What is the slope of line p?

1. x intercept is twice the y intercept
2. The line passes through the I and III quadrant

OA is C

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Source: Beat The GMAT — Data Sufficiency | Wed Jul 17, 2013 1:16 am

swathi8388: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Tue Nov 29, 2011 1:17 am; Thanked: 1 times

by swathi8388 » Wed Jul 17, 2013 3:46 am

I really cannot understand how the answer is C!

1. says x intercpet is twice of y , so for a line with equation y=mx+c , y intercept = c and x intercept = -c/m

so we have -c/m = 2c and here c's sign does not matter so m=-1/2

2.We dont need this information (??)

so answer according to me should be A

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Wed Jul 17, 2013 6:15 am

sana.noor wrote:What is the slope of line p?

1. x intercept is twice the y intercept
2. The line passes through the I and III quadrant

OA is C

Hi Sana,

Are you sure this question has been transcribed properly?
Also, are you sure the answer is C?
What's the source?

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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sana.noor: Legendary Member; Posts: 512; Joined: Mon Jun 18, 2012 11:31 pmFollowed by: 20 members; Thanked: 42 times

by sana.noor » Wed Jul 17, 2013 9:46 am

i was solving question from BTG forum and found this question...here is the link
https://www.beatthegmat.com/coordinate-g ... 57046.html

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Wed Jul 17, 2013 9:54 am

Let's call this an unknown source, since the original question does not site a source.

There are a few problems with this question.
For example, if the x intercept is twice the y intercept, we could say that the line passes through the origin (0,0), in which case the x-intercept (0) is theoretically twice the y-intercept (0).
If the line also passes through the I and III quadrants, then there could be any number of slopes.
So, we could say that the answer is E

Of course, I'm not a big fan of saying that something is "twice" another thing if those two things are both equal to zero. I don't think the test-makers are fond of this either.

My advice is that we skip this question and move along.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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