• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

## xy plane

This topic has 2 member replies
beater Master | Next Rank: 500 Posts
Joined
22 Apr 2008
Posted:
301 messages
2

#### xy plane

Thu Jan 01, 2009 1:05 pm
In the xy-plane, if line k has negative slope and passes through the point (-5,r), is the x intercept of line k positive?

1. the slope of line k is -5
2. r > 0

Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
ronniecoleman Legendary Member
Joined
16 Nov 2008
Posted:
546 messages
13
Test Date:
29th jan
Target GMAT Score:
780+
GMAT Score:
NA
Thu Jan 01, 2009 11:03 pm
In the xy-plane, if line k has negative slope and passes through the point (-5,r), is the x intercept of line k positive?

1. the slope of line k is -5
2. r > 0

equation of a line

Y = MX + C

given that m = -ve

r = -5m + c

c = r+5m

x intercept is - c/m

now since m is negative , c has to be postive to make the intercept postive

r+5m

1) m = -5

r -25

2) r > 0

still no clue

togther too we cannot find...

IMO E

_________________
011-27565856

Thanked by: beater
logitech Legendary Member
Joined
20 Oct 2008
Posted:
2136 messages
Followed by:
24 members
237
GMAT Score:
730
Thu Jan 01, 2009 3:27 pm
beater wrote:
In the xy-plane, if line k has negative slope and passes through the point (-5,r), is the x intercept of line k positive?

1. the slope of line k is -5
2. r > 0

y = mx+b , where m is the slope

X intercept of the line is at (X,0) so :

0 = mx+b

x= -b/m

so we will try to find out whether -b/m is positive or not.

1) m=-5 no info given for b

r = (-5)(-5)+b

r = 25+b

b=r-25 We dont know what r is so we can not decided whethjer -b/m is postive = 25-r/-5

2) r > 0

r = -5m+b

-5m+b > 0

b > 5m

5m is a negative value since We know that slope is NEGATIVE

so we can not decide whether b is positive or negative

INSUF

Statement 1 & 2

r = 25+b

25+b > 0

b > -25

It could be Postie or Negative

So I would go with E

_________________
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"

Thanked by: beater

### Best Conversation Starters

1 lheiannie07 116 topics
2 LUANDATO 67 topics
3 swerve 66 topics
4 ardz24 61 topics
5 AAPL 59 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 Scott@TargetTestPrep

Target Test Prep

213 posts
2 Brent@GMATPrepNow

GMAT Prep Now Teacher

177 posts
3 Jeff@TargetTestPrep

Target Test Prep

168 posts
4 Rich.C@EMPOWERgma...

EMPOWERgmat

133 posts
5 GMATGuruNY

The Princeton Review Teacher

126 posts
See More Top Beat The GMAT Experts