Answer
$-8$
Work Step by Step
Given $\begin{vmatrix} x & y\\ a & b \end{vmatrix}=bx-ay=8$, we have
$\begin{vmatrix} y & x\\ b & a \end{vmatrix}=ay-bx=-(bx-ay)=-8$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 10 - Systems of Equations and Inequalities - Chapter Review - Review Exercises - Page 815: 33
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