Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 10 - Section 10.1 - Systems of Linear Equations in Two Variables - 10.1 Exercises - Page 688: 13

Answer

$ x=-2$ $y=3 $

Work Step by Step

$2x+y=-1 \rightarrow$ Multiply the first equation by 2. $x-2y=-8$ $4x+2y=-2$ $x-2y=-8$ Add the equations to eliminate y. $ 5x=-10$ $ x=-2$ Substitute for x and solve for y. $y=-1-2x $ $y=3 $
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