If a and b are positive numbers, what are the coordinates of : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 17 Jan 2017, 07:14

### GMAT Club Daily Prep

#### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If a and b are positive numbers, what are the coordinates of

Author Message
Manager
Joined: 30 Jan 2006
Posts: 145
Followers: 1

Kudos [?]: 25 [0], given: 0

If a and b are positive numbers, what are the coordinates of [#permalink]

### Show Tags

17 Apr 2006, 14:36
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If a and b are positive numbers, what are the coordinates of the midpoint of line segment CD in the xy-plane?

1) The coordinates of C are (a, 1-b)
2) The coordinates of D are (1-a, b)

Please explain your answer. I donâ€™t know how to solve this question [i.e., if it were a PS question]
VP
Joined: 29 Apr 2003
Posts: 1403
Followers: 2

Kudos [?]: 28 [0], given: 0

### Show Tags

17 Apr 2006, 15:12
The midpoint of a line A(ax,ay) and B (bx, by)

=

((ax+bx)/2, (ay+by)/2)

So in the given example the midpoint appears to be (1/2, 1/2) when u use both eq 1 and eq 2.

Hence, Ans - C
Manager
Joined: 30 Jan 2006
Posts: 145
Followers: 1

Kudos [?]: 25 [0], given: 0

### Show Tags

17 Apr 2006, 18:05
Thanks a bunch! Seems so obvious now, that it should be half the value of the sum of the x's and half the value of the sum of the y's
VP
Joined: 29 Apr 2003
Posts: 1403
Followers: 2

Kudos [?]: 28 [0], given: 0

### Show Tags

18 Apr 2006, 01:33
No problems. We shud make a list of formula to study... some kinda summary sheet!
Manager
Joined: 30 Jan 2006
Posts: 145
Followers: 1

Kudos [?]: 25 [0], given: 0

### Show Tags

18 Apr 2006, 03:39
That's actually a great idea! I wish that suggestion would have came up a few weeks ago though, because I am taking my test tomorrow! hehe... *feeling nervous*... so if I fail, I'll definitely be back to take up on your advice
18 Apr 2006, 03:39
Display posts from previous: Sort by