Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 7 - Section 7.1 - Systems of Linear Equations in Two Variables - Exercise Set - Page 823: 108


The liar twin is talking.

Work Step by Step

Let us assume x and y to be the first and second lucky number: So, according to the first condition: $3x+6y=12$ $x+2y=4$ …… (I) Then, from the second condition: $x+2y=5$ …… (II) Then, from equation (I), $x+2y=4$ But from the second equation, $x+2y=5$ So, this twin is a liar. Thus, the speaking twin is a liar.
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