Answer
$x=-5$
Work Step by Step
2 by 2 determinant: $D=\left|\begin{array}{ll}
a & b\\
c & d
\end{array}\right|=ad-bc$
---
$\left|\begin{array}{ll}{x}&{x}\\{4}&{3}\end{array}\right|=3x-4x=-x$,
so we are solving
$-x=5$
$x=-5$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 8 - Section 8.3 - Systems of Linear Equations: Determinants - 8.3 Assess Your Understanding - Page 583: 51
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