[tex]\displaystyle \left \{ {{x+2y=4} \atop {3x-2y=-28}} \right. \\\\\left \{ {{2y=4-x} \atop {3x-2y=-28}} \right.\\ \\3x-(4-x)=-28\\x=-6\\3(-6)-2y=-28\\y=5\\(x,y)=(-6,5)[/tex]