Skorzystamy z metody podstawiania.
[tex]\left \{ {{x+2y=10} \atop {x-y=1}} \right. \\\left \{ {{x=-2y+10} \atop {-2y+10-y=1}} \right. \\\left \{ {{x=-2y+10} \atop {-2y-y=1-10}} \right. \\\left \{ {{x=-2y+10} \atop {-3y=-9\ |:(-3)}} \right. \\\left \{ {{x=-2y+10} \atop {y=3}} \right. \\\left \{ {{x=-2*3+10} \atop {y=3}} \right. \\\left \{ {{x=-6+10} \atop {y=3}} \right. \\\left \{ {{x=4} \atop {y=3}} \right.[/tex]
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Skorzystamy z metody podstawiania.
[tex]\left \{ {{x+2y=10} \atop {x-y=1}} \right. \\\left \{ {{x=-2y+10} \atop {-2y+10-y=1}} \right. \\\left \{ {{x=-2y+10} \atop {-2y-y=1-10}} \right. \\\left \{ {{x=-2y+10} \atop {-3y=-9\ |:(-3)}} \right. \\\left \{ {{x=-2y+10} \atop {y=3}} \right. \\\left \{ {{x=-2*3+10} \atop {y=3}} \right. \\\left \{ {{x=-6+10} \atop {y=3}} \right. \\\left \{ {{x=4} \atop {y=3}} \right.[/tex]