[tex]\displaystyle \left \{ {{2x+y=8} \atop {2x-y=0}} \right. \\\\\left \{ {{2x+y=8} \atop {2x=y}} \right. \\\\y+y=8\\y=4\\2x=4\\x=2\\(x,y)=(2,4)[/tex]
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[tex]\displaystyle \left \{ {{2x+y=8} \atop {2x-y=0}} \right. \\\\\left \{ {{2x+y=8} \atop {2x=y}} \right. \\\\y+y=8\\y=4\\2x=4\\x=2\\(x,y)=(2,4)[/tex]