December 2018 1 6 Report
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  A)\\ \left \{ {{4x=y} \atop {y=x+13}} \right. \\ B\\ \left \{ {{4(x-1)=y} \atop {(y-1)+13=x}} \right. \\ C  \left \{ {{x-1=4y} \atop {(y-1)+13=x}} \right. \\ D  \left \{ {{y-3x=2} \atop {4x-y=4}} \right. \\ E  \left \{ {{x+7y=10} \atop {5x-y=8}} \right.

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