Forgot Password?
 
Links
About Arcadia LSAT Shorthand NotationArcadia Prep's GMAT CourseArcadia Prep's LSAT CourseArcadia Prep's SAT CourseArcadia Prep's GRE CourseThe Simply Brilliant GMAT AppAbout the MCATMCAT Physical and Biological SciencesAbout Arcadia Prep's MCAT CourseTerms of SaleTerms of UseAbout Arcadia Apps
iPhone App Store
GGRE Prep App
GMAT Prep App
LSAT Prep App
LSAT Prep
SAT Prep App
 
Back to Questions

Suppose . Then x equals

Suppose .  Then x equals
(A)  
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set K - Equations

Collapse All Subordinate Threads
Image Not Available
 
Replies to This Thread: 0 | ----
 
Posted: 12/21/2012 12:42
What's this ?
Image Not Available
 
Replies to This Thread: 1 | ----
 
Posted: 02/04/2013 17:41
Something is measing!
Arcadia
Admin
Reply 1 of 1
Replies to This Thread: 0 | ----
 
Posted: 02/05/2013 01:00
Hi Andres,

The "triple" equation x = y - 2 = (y + 5)/2 is compact way of writing three separate equations:

1) x = y - 2
2) y - 2 = (y + 5)/2
3) x = (y + 5)/2

We will use only equations 1 and 2 to find the value of x. Multiplying both sides of Equation 2 by 2 yields

2(y - 2) = y + 5

Distributing the 2 on the left-hand side of this equation yields

2y - 4 = y + 5

Subtracting y and adding 4 to both sides yields

y = 9

Now, replacing y with 9 in Equation 1 yields

x = y - 2 = 9 - 2 = 7

Hence, the answer is E.

Nova Press
Arcadia Prep © 2012.
Contact Arcadia  |  Terms of Use  |  Terms of Sale  |  Change Log-in Info