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

Redeem

10

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 789
Joined: Sun May 06, 2007 1:25 am
Location: Southern California, USA
Thanked: 15 times
Followed by:6 members

10

by resilient » Sun Feb 17, 2008 11:27 pm
Which of the following equations represents a line that is perpendicular to the line described by the equation 3x + 4y = 8 ?
a.3x + 4y = 18
b.3x – 4y = 24
c.4y – 3x = 26
d.1.5y + 2x = 18
e.8x – 6y = 24

qa is e i chose d
Appetite for 700 and I scraped my plate!
Top
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 19
Joined: Wed Feb 06, 2008 9:22 am

by gmatjoe » Mon Feb 18, 2008 8:11 am
I solved this question through elimination of the answers, because it's not mentioned at which coordinate the 2 lines crosses each other:

Rewrite 3x+4y=8 to y=-3/4(x)+2

Perpendicular line to this function must have positive slopes: eliminate answers (a) and (d).

Furthermore, slope must be inverse, thus answer must read y=4/3(x)+something: eliminate answer (b) and (c), leaving (d) as the correct answer.

Hope this helps. Joe.
Top
Post new topic Post Reply
• Page 1 of 1