Odpowiedź :
[tex]\left \{ {{x+3y=11} \atop {2x-4y=2}} \right. \\\left \{ {{x=-3y+11} \atop {2*(-3y+11)-4y=2}} \right. \\\left \{ {{x=-3y+11} \atop {-6y+22-4y=2}} \right. \\\left \{ {{x=-3y+11} \atop {-6y-4y=2-22}} \right. \\\left \{ {{x=-3y+11} \atop {-10y=-20\ |:(-10)}} \right.\\\left \{ {{x=-3y+11} \atop {y=2}} \right.\\\left \{ {{x=-3*2+11} \atop {y=2}} \right.\\\left \{ {{x=5} \atop {y=2}} \right.[/tex]