Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 3 - Section 3.1 - Systems of Linear Equations in Two Variables - 3.1 Exercises: 68

Answer

$x=-1$ $y=-11$

Work Step by Step

Equation 2 is already solved for y, we substitute y in the first equation, with the expression in the second: $6x-y=5$ $6x-11x=-5x=5$ $x=-1$ $y=11x=-11$ We need to check, if it is the right solution, we substitute x with -1 and y with -11: $6(-1)-(-11)=5$ $\checkmark$ $-11=11(-1)$ $\checkmark$
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