Answer
$$n=-3,\:m=5,\:l=2$$
Work Step by Step
Solving the system of equations using substitution, we find:
$$ 4\left(7-\frac{9-2n}{3}\right)+n=5 \\ n=-3 \\ m=\frac{9-2\left(-3\right)}{3}=5 \\ l=7-5=2$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 8 - Systems of Linear Equations and Problem Solving - 8.4 Systems of Equations in Three Variables - 8.4 Exercise Set - Page 538: 34
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