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Solve the System Using Gaussian Elimination (x,y)( x , y )

Question 6

Multiple Choice

Solve the system using Gaussian elimination. If (x,y) ( x , y ) is the solution to the system, give the value of 2xy2 x - y .
{x+y=23x2y=13\left\{ \begin{array} { c } x + y = 23 \\x - 2 y = - 13\end{array} \right.


A) 10\quad 10
B) 13
C) 7\quad 7
D) 8\quad 8
E) 9\quad 9

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