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reduce matrix ???

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reduce matrix ???

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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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.
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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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