[tex]\displaystyle \left \{ {{4y-x=11} \atop {5x-2y=17}} \right. \\\\\left \{ {{x=-11+4y} \atop {5x-2y=17}} \right.\\ \\5(-11+4y)-2y=17\\y=4\\x=-11+4*4\\x=5\\(x,y)=(5,4)[/tex]