Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 4 - Review - Page 251: 50

Answer

no solution

Work Step by Step

Using the properties of equality, the first equation, $ x-4y=4 ,$ is equivalent to \begin{array}{l}\require{cancel} x=4y+4 .\end{array} Substituting $x=4y+4$ into the second equation results to \begin{array}{l}\require{cancel} \dfrac{1}{8}x-\dfrac{1}{2}y=3 \\\\ \dfrac{1}{8}\left( 4y+4 \right)-\dfrac{1}{2}y=3 \\\\ 8\left[ \dfrac{1}{8}\left( 4y+4 \right)-\dfrac{1}{2}y \right]=3(8) \\\\ 1(4y+4)-4(y)=3(8) \\\\ 4y+4-4y=24 \\\\ 4y-4y=24-4 \\\\ 0=20 \text{ (FALSE)} .\end{array} Since the solution above ended with a FALSE statement, then there is $\text{ no solution }$ to the given system of equations.
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