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Algebra

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Cramer's Rule 7

ALGEBR-4GDEGX

Find the value of $x$ from the system of equations using Cramer's Rule:

$$\begin{array}{lcl}-x -2 y &=&1 \\\ -3x + y & = & 0 \end{array}$$

A

$-\cfrac{1}{7}$

B

$\cfrac{1}{17}$

C

$\cfrac{2}{7}$

D

$\cfrac{1}{7}$