[tex]\displaystyle \left \{ {{x+y=7} \atop {x-y=3}} \right. \\\\\left \{ {{x+y=7} \atop {x=3+y}} \right. \\\\3+y+y=7\\y=2\\x=3+2\\x=5\\(x,y)=(5,2)[/tex]
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[tex]\displaystyle \left \{ {{x+y=7} \atop {x-y=3}} \right. \\\\\left \{ {{x+y=7} \atop {x=3+y}} \right. \\\\3+y+y=7\\y=2\\x=3+2\\x=5\\(x,y)=(5,2)[/tex]