[tex] \left \{ {{y=covrigi} \atop {x=chifle}} \right. \left \{ {{8y+5x=18} \atop {25x+12Y=62}} \right. \left \{ {{5X+18y=18(*5)} \atop {25x+12y=62}} \right. \left \{ {{25x+40y=90(-)} \atop {25+12y=62}} \right. \left \{ {{28y=28} \atop {y=1}} \right. \left \{ {{2x=10} \atop {x=5}} \right. [/tex]