Answer
$3x+y+z=4$
$-y+z=-1$
Work Step by Step
To eliminate the x-term from the second equation, add the second and the third equation.
$-x+y+2z+(x-2y-z)=0-1$
$-y+z=-1$
The new system is:
$3x+y+z=4$
$-y+z=-1$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 10 - Section 10.2 - Systems of Linear Equations in Several Variables - 10.2 Exercises - Page 697: 13
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