reduce matrix ???

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raneem: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Mon May 07, 2012 9:50 pm

by raneem » Mon May 07, 2012 10:04 pm

hi everyone,
could you help me with this problem,please!??
reduce this matrix ..

x+x-2x+x=9
x-x+2x=1
x-3x=5

1 1 -2 1 9
0 1 -1 2 1
0 0 1 -3 5

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Source: Beat The GMAT — Problem Solving | Mon May 07, 2012 10:04 pm

aneesh.kg: Master | Next Rank: 500 Posts; Posts: 385; Joined: Mon Apr 16, 2012 8:40 amFollowed by: 29 members; Location: Pune, India; Thanked: 186 times

by aneesh.kg » Mon May 07, 2012 10:14 pm

And I thought this was a GMAT forum!

by the way, cramster.com can help you.

Aneesh Bangia
GMAT Math Coach
[email protected]

GMATPad:
Facebook Page: https://www.facebook.com/GMATPad

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Tue May 08, 2012 5:51 am

raneem wrote:hi everyone,
could you help me with this problem,please!??
reduce this matrix ..

x+x-2x+x=9
x-x+2x=1
x-3x=5

1 1 -2 1 9
0 1 -1 2 1
0 0 1 -3 5

This is neither a GMAT question nor a question requiring a matrix.
You have 3 separate equations involving one variable, x.
The solutions are:
x=9
x=0.5
x=-2.5

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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