Precalculus: Mathematics for Calculus, 7th Edition

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: 9



Work Step by Step

To solve for z in the last equation divide both sides by 2. When we do so we see z is 3. Substituting it into the second equation we get $-y+9=9$. Thus y is 0. We substitute these variables into the first equation. We get $x + 3 =7$ . x is 4.
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