Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 8 - Coordinate Geometry and Linear Systems - 8.5 - Systems of Two Linear Equations - Problem Set 8.5 - Page 370: 69


The answer is below.

Work Step by Step

In order to solve a system of equations, we (1) isolate one variable in one of the equations. (In this case, it would be best to isolate the y in the lower equation.) We then (2) plug the value of this variable into the other equation. (In this case, we plug in the value of y into the upper equation.) We then (3) solve the upper equation for the value of y. Finally, we (4) use the value of y found to find the value of x.
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