Odpowiedź:
[tex]\left \{ {{2x+y=8} \atop {x-3y=-3}} \right. \\ \left \{ {{y=-2x+8} \atop {x-3y=-3}} \right. \\ \left \{ {{y=-2x+8} \atop {x-3(-2x+8)=-3}} \right. \\ \left \{ {{y=-2x+8} \atop {x+6x-24=-3}} \right. \\ \left \{ {{y=-2x+8} \atop {7x=-3+24}} \right. \\ \left \{ {{y=-2x+8} \atop {7x=21/:7}} \right.\\ \left \{ {{y=-2x+8} \atop {x=3}} \right. \\ \left \{ {{y=-2*3+8} \atop {x=3}} \right. \\ \left \{ {{y=2} \atop {x=3}} \right.[/tex]
