Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

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 - Connecting: The Concepts - Exercises - Page 516: 2



Work Step by Step

The equations are in standard form. The coefficients of y are $\pm 1$, which makes y easy to eliminate by adding ... we use the elimination method. Add the equations: $ 2x=18\qquad$ ... and solve for x $x=9$ Now, back-substitute into one of the initial equations $x+y=10$ $9+y=10$ $y=1$ Form an ordered pair $(x,y) $ as the solution to the system $(9,1)$
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