BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Value of b?

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 882
Joined: Fri Feb 20, 2009 2:57 pm
Thanked: 15 times
Followed by:1 members
GMAT Score:690

Value of b?

by crackgmat007 » Wed May 13, 2009 9:16 pm
In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope 2/3. What is the value of b?
(1) a = 4
(2) c = −6

Pls explain the logic to arrive at the solution. Answer seems to be A. Tx
Top
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 16
Joined: Mon Sep 01, 2008 8:13 pm
Thanked: 3 times
GMAT Score:700

by ontherocks27 » Wed May 13, 2009 11:17 pm
First rephrase and put the equation in the slope intercept form:

ax+by+c=0
=> by=-ax-c
=> y= (-a/b)x+(-c/b)

Given slope = 2/3 = (-a/b)

We can find b if we know a

Statement 1:
a = 4. Sufficient

Statement 2:
c=-6. Insufficient

Hence A
Top
Legendary Member
Posts: 1169
Joined: Sun Jul 06, 2008 2:34 am
Thanked: 25 times
Followed by:1 members

by aj5105 » Thu May 14, 2009 12:19 am
(A)

As explained above.
Top
Post new topic Post Reply
• Page 1 of 1