Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
In the xy-plane, region R consists of all the points (x, y) such [#permalink]
01 Apr 2011, 22:01
In the xy-plane, region R consists of all the points (x, y) such that 2x + 3y <= 6. Is the point (r, s) in region R ? (1) 3r + 2s = 6 (2) r <= 3 and s <= 2
Can someone solve this problem graphically. I have trouble understanding the explanation given in OG. If it is explained graphically, it would be greatly appreciated. Thank you _________________
Re: OG, question 121, please, help with the graph [#permalink]
02 Apr 2011, 07:27
3
This post received KUDOS
The initial set R is y<=2-2x/3
The set from (1) is line y=3-3x/2 As you could see the line has points in the set R and outside it
The set from (2) is y<=2, x<=3 As you can see the blue set has points lying into the red set R and outside of it
The intersection of both sets (1) and (2) together also does not give definiteness. As you could see from the picture, the green line goes both through blue set only and through red and blue sets.
SO, the answer is E. _________________
If my post is useful for you not be ashamed to KUDO me! Let kudo each other!
Re: OG, question 121, please, help with the graph [#permalink]
02 Apr 2011, 13:52
3
This post received KUDOS
mirzohidjon wrote:
In the xy-plane, region R consists of all the points (x, y) such that 2x + 3y <= 6. Is the point (r, s) in region R ? (1) 3r + 2s = 6 (2) r <= 3 and s <= 2
Can someone solve this problem graphically. I have trouble understanding the explanation given in OG. If it is explained graphically, it would be greatly appreciated. Thank you
Please see the attached image.
The turquoise line is the stem inequality 2x + 3y <= 6. Because the inequality says "<=", the region below the line will be valid region. Below means South-West side or the left side of the line.
(1) It is the equation of a line that is denoted by red line. Just look at the intersection of turquoise and red-line. It is at about (1.4,1.1). All red points above that intersection is outside the region defined by the turquoise line and all red points below that intersection is within the region. Thus, (r,s) may be within the region or outside the region. Not Sufficient.
(2) It is denoted by the blue lines. The point of intersection is (3,2). Thus, everything that is south-west from that point will be the region. South-west means below and left of the co-ordinate. We can clearly see that (0,0) is within the range that is defined by the turquoise line. And (3,2) is a point outside the region that is defined by the turquoise line. Thus (r,s) could be within the turquoise region or outside of it. Not Sufficient.
Combining both statements; We still have two regions: one within the turquoise, another outside. Outside the turquoise region: The red line between horizontal blue line and turquoise line. Within the turquoise region: The red line between vertical blue line and turquoise line. Not Sufficient.
Ans: "E"
Attachments
Inequality_Graphical.png [ 19.19 KiB | Viewed 3271 times ]
Re: OG, question 121, please, help with the graph [#permalink]
02 Apr 2011, 22:02
1
This post received KUDOS
gmat1220 No. As you could see the set (1) is just a green line, not any area. The set (2) is blue infinite rectangle. Therefore the inersection of (1) and (2) can not be anything but the part of the line or separate points. The intersection of (1) and (2) is a part of green line, which goes through blue set, between the points of intersection of the green line and two blue lines: vertical and horizontal. _________________
If my post is useful for you not be ashamed to KUDO me! Let kudo each other!
Re: OG, question 121, please, help with the graph [#permalink]
28 Jun 2011, 11:14
1
This post received KUDOS
Here is a video explanation to this problem: http://www.gmatquantum.com/list-of-vide ... ds121.html This is a really difficult problem, but I do recommend students to learn the pieces in this problem that are likely to be relevant to new GMAT questions.
Re: In the xy-plane, Region R consists of [#permalink]
02 Aug 2011, 20:19
Solution for the changed problem:
Using statement (1), if 3r + 2s=6, then at (2,0) the point (r,s) lies within region R but at (0,3) it does not. Insufficient.
Using statement (2), if r<=3 and s<=2, then the point (0,2) lies within the region R but the point (3,2) does not. Insufficient.
Combining statements (1) and (2), the point (2,0) lies within region R and satisfies both the statements too. However, the point (1,3/2) does not lie within the region R even though it satisfies both the other statements. Insufficient.
Re: In the xy-plane, region R consists of all the points (x, y) [#permalink]
09 Nov 2011, 19:59
how are you supposed to do this question in 1-2 minutes? or can we give ourselves more time for difficult questions like these? if one anticipates scoring highly on the quant section does it mean every question is going to be hard? (and hence every question will be this difficult, and thus can't take more than avg for every question?)
Re: In the xy-plane, region R consists of all the points (x, y) [#permalink]
14 Nov 2011, 08:55
This question is rather difficult and I know that I would struggle to do it under 2 minutes. However, if you can get sketch the graph relatively quickly and see what they are asking by sketching the 2 conditions, it is doable.
OG's explanation is not as intuitive and I would have a difficult time using that method to solve this in 2 minutes.
gmatclubot
Re: In the xy-plane, region R consists of all the points (x, y)
[#permalink]
14 Nov 2011, 08:55
As I’m halfway through my second year now, graduation is now rapidly approaching. I’ve neglected this blog in the last year, mainly because I felt I didn’...
Perhaps known best for its men’s basketball team – winners of five national championships, including last year’s – Duke University is also home to an elite full-time MBA...
Hilary Term has only started and we can feel the heat already. The two weeks have been packed with activities and submissions, giving a peek into what will follow...