It is currently 23 Jun 2017, 00:38

### 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

# X = 0

Author Message
Manager
Joined: 29 Apr 2003
Posts: 93
Location: Singapore

### Show Tags

12 Jan 2004, 15:41
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

From the below question, if x=o, the answer states that if x=0, and y = 3 clearly satisfy x^2=xy. I was thinking if x=o, y would be 0. Could anyone explain?

If x and y are different integers and x^2=xy, which of the must be true?

I. x = 0
II. y = 0
III. x = -y

a) I only
b) II only
c) III only
d) I an III only
e) I, II, III
Director
Joined: 28 Oct 2003
Posts: 501
Location: 55405

### Show Tags

12 Jan 2004, 15:44
If X is zero, Y can be anything you want it to be.
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288

### Show Tags

12 Jan 2004, 16:07
x^2 = xy
x^2 - xy = 0
x ( x - y ) = 0
Therefore, for the equation to hold, X HAS to = 0
Y could be anything. Y does not have to be 0. Say Y = 0 but X = 5, then the expression does not equal to 0. say X = -Y and X = 5 then Y = -5. Plug it in the formula to get 5 ( 5 - (-5) ) = 5*10 = 50 and not equal to 0. True that Y = to 0 ONLY IF X is. However, the expression will NOT give you 0 in all scenarios if only Y = 0.
_________________

Best Regards,

Paul

Manager
Joined: 26 Dec 2003
Posts: 227
Location: India

### Show Tags

13 Jan 2004, 02:52
a) 1 only? becoz x has to be 0 but y can be anything
13 Jan 2004, 02:52
Display posts from previous: Sort by