Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - 9.1 Systems of Linear Equations - 9.1 Exercises: 9

Answer

$\{(48,8)\}$

Work Step by Step

1. The second equation has x already expressed in terms of y $x=6y$ 2. Substitute $x$ in the other equation and solve. $x-5y=8$ $(6y)-5y=8$ $y=8$ 3. Back-substitute into the expression of $x$ (step 1). $x=6(8)=48$ 4. Write the solution as an ordered pair. Solution set: $\{(48,8)\}$
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