College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 6, Matrices and Determinants - Section 6.4 - Determinants and Cramer's Rule - 6.4 Exercises - Page 534: 44

Answer

$x=-2,y=6$

Work Step by Step

Cramer's Rule for $2$ equations in $2$ unknowns says that the system of linear equations is equivalent to the matrix equation $DX=B$ and if $|D|\ne 0$, then the solutions are $x_i=\frac{|D_{x_i}|}{|D|}$ where $D_{x_i}$ can be obtained by replacing the $i$th column of $D$ by $B$ Hence, we have: $|D|=0.5(-1/6)-(1/3)(1/4)=-1/6$ $|D_x|=1(-1/6)-(1/3)(-3/2)=1/3$ $|D_y|=0.5(-3/2)-(1)(1/4)=-1$ Thus $x=\frac{|D_x|}{|D|}=-2,y=\frac{|D_y|}{|D|}=6$
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