Answer
$y$
Work Step by Step
The y in the first equation has coefficient 1, so it can be isolated without encountering fractions...
$3x+y=4\qquad/-3x$
$y=4-3x \qquad ...$etc
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 9 - Systems and Matrices - 9.1 Systems of Linear Equations - 9.1 Exercises - Page 856: 4
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