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vinviper1: Master | Next Rank: 500 Posts; Posts: 222; Joined: Tue Mar 25, 2008 3:52 pm; Thanked: 2 times

by vinviper1 » Wed Apr 23, 2008 10:20 am

Just want to make sure I am on the right track with this….I simply said to myself that it cannot be it as the points were not decimals/fractions and therefore cannot be in a line with an integer over integer slope. Thanks!

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Source: Beat The GMAT — Data Sufficiency | Wed Apr 23, 2008 10:20 am

akshatsingh: Senior | Next Rank: 100 Posts; Posts: 77; Joined: Thu Apr 10, 2008 10:13 pm; Thanked: 4 times

by akshatsingh » Wed Apr 23, 2008 10:50 pm

Form the equation of the line with the slope-point form.
Then, substitute value of x by -2/3 and see if y comes out to be 1/2.

Since equation of lines can be formed by usung both equations seperately, we can say that it can be determined if (-2/3,1/2) lies on the linw with the given slope.

Cheers!
Aks

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Thu Apr 24, 2008 11:33 am

For DS, we always want to focus on the kind of information that will lead to an answer. It's important to remember that we don't actually care what the answer is.

For this question, we're given the slope and want to know if the line passes through a particular point.

(1) and (2) each give us a point on the line. From the slope and 1 point, we can determine the equation of the line. If we can determine the equation, then we can answer ANY POSSIBLE question about that line. So, each of (1) and (2) will be sufficient alone: choose (d).

Your specific reasoning was actually wrong - we can definitely have a combinate of (integer,integer) points and (non-integer, non-integer) points on lines with fractional slopes.

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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luvaduva: Senior | Next Rank: 100 Posts; Posts: 84; Joined: Tue Feb 05, 2008 8:52 pm; Thanked: 8 times

by luvaduva » Thu Apr 24, 2008 8:26 pm

To reiterate what Stuart said:

For DS, we always want to focus on the kind of information that will lead to an answer. It's important to remember that we don't actually care what the answer is.

hehe

This is something I continuously have to remind myself of. Nothing worse than turning a 10 second problem into a 2 minute one.

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mbaapplicant2008: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Thu Oct 30, 2008 1:21 am

by mbaapplicant2008 » Thu Oct 30, 2008 7:31 pm

thanks, i found this question at all.

MBA Applicant

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